## Search This Blog

### Rebus Word Problem

Rebus Word Problem - 30 April

What does this say? esgg sgeg gegs gsge

### Mathematical Puzzles

Top 20 Mathematical Puzzles

Mathematical Puzzles 1 : Brain Twister Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

2+3=8,
3+7=27,
4+5=32,
5+8=60,
6+7=72,
7+8=??

Solve it?

==============================================

Mathematical Puzzles 2 : Hardest Math Riddle
Difficulty ★★★★★     Popularity ★★★★★

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

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Mathematical Puzzles 3 : February Maths Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

Using eight eights and addition only, can you make 1000?

==============================================

Mathematical Puzzles 4 : Secret Code puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

A man wanted to get into his work building, but he had forgotten his code. However, he did remember five clues. These are what those clues were:

The fifth number plus the third number equals fourteen.

The fourth number is one more than the second number.

The first number is one less than twice the second number.

The second number plus the third number equals ten.

The sum of all five numbers is 30.

What were the five numbers and in what order?

==============================================

Mathematical Puzzles 5 : Gold Bar Fewest Cut Puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

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Mathematical Puzzles 6 : Weighing Balance Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

You can place weights on both side of weighing balance and you need to measure all weights between 1 and 1000. For example if you have weights 1 and 3,now you can measure 1,3 and 4 like earlier case, and also you can measure 2,by placing 3 on one side and 1 on the side which contain the substance to be weighed. So question again is how many minimum weights and of what denominations you need to measure all weights from 1kg to 1000kg.

==============================================

Mathematical Puzzles 7 : Hard Maths Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

==============================================

Mathematical Puzzles 8 : November Maths Puzzle
Difficulty ★★☆☆☆     Popularity ★★★★☆

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

==============================================

Mathematical Puzzles 9 : Maths Joke Puzzle
Difficulty ★★☆☆☆     Popularity ★★★★☆

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

==============================================

Mathematical Puzzles 10 : Interesting Number puzzle
Difficulty ★★★☆☆     Popularity ★★★☆☆

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

==============================================

Mathematical Puzzles 11 : CAT Exam Puzzle
Difficulty ★★★☆☆     Popularity ★★★☆☆

5+3+2 = 151022
9+2+4 = 183652
8+6+3 = 482466
5+4+5 = 202541
THEN ;
7+2+5 =

==============================================

Mathematical Puzzles 12 : Simple Simple Google Interview Puzzle
Difficulty ★★☆☆☆     Popularity ★★★☆☆

The puzzle is if the shopkeeper can only place the weights in one side of the common balance. For example if shopkeeper has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names the weights you will need to measure all weights from 1 to 1000. This is a fairly simple problem and very easy to prove also.  Answer for this puzzle is given below.

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Mathematical Puzzles 13 : November Puzzle
Difficulty ★★★☆☆     Popularity ★★★☆☆

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

==============================================

Mathematical Puzzles 14 : Maths Puzzle
Difficulty ★★★★☆     Popularity ★★★☆☆

How can I get the answer 24 by only using the numbers 8,8,3,3.

You can use the main signs add, subtract multiply and divide.

==============================================

Mathematical Puzzles 15 : Math Puzzle
Difficulty ★★★☆☆     Popularity ★★★☆☆

You have 1023 apples and 10 bags. You have to distribute these lemons in these 10 bags in any way you choose. But when I ask for a certain number of lemons you have to give them in terms of bags without transferring the lemons from other bags. How do you distribute the lemons?

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Mathematical Puzzles 16 : Sam Loyd Maths Puzzle
Difficulty ★★★☆☆     Popularity ★★★☆☆

Charley Smalleash treats his best girl to a trolley ride, but on account of his limited resources they plan to walk back, so, if the car goes at the rate of nine miles an hour and they can walk at the rate of three miles an hour, how far could they ride if they must be back in eight hours?

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Mathematical Puzzles 17 : Maths Quiz
Difficulty ★★☆☆☆     Popularity ★★★☆☆

Fred can eat 27 chocolates in a hour, Alice can eat 2 chocolates in 10 minutes, and Kelly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a large box of 120 chocolates whilst watching a movie?

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Mathematical Puzzles 18 : Smart Math Problem
Difficulty ★★★★☆     Popularity ★★★☆☆

As they say, beggars can't be choosers, in fact begger take what they can get. A begger on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the begger finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

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Mathematical Puzzles 19 : Classic Hens Eggs Puzzle
Difficulty ★★★★☆     Popularity ★★★☆☆

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

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Mathematical Puzzles 20 : Identify The 4 Numbers
Difficulty ★★★☆☆     Popularity ★★★☆☆

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

==============================================

Last Updated:2012-04-28

### Fun With Riddle

Fun With Riddle - 27 April

who is silent in the parliament

### Logical Riddle

Logical Riddle - 26 April

A Child was born on Lahore, Pakistan.Still child is not a pakistani citizen.why ?

### Humorous Riddle

Humorous Riddle - 25 April

To whom do all men take off their hats?

### Mathematical Puzzle

Mathematical Puzzle - 24 April

Suppose I am a grandfather. My grandson is about as old in days as my son is in weeks. He is also as many months old as I am in years. Together, the three of us are 140 years old. How old am I?

### Rebus Riddle

Rebus Riddle - 23 April

What does this mean? CCCCCCC

### Really Hard Riddles

Top 20 Really Hard Riddles

Really Hard Riddles 1 : September Riddle
Difficulty ★★★★☆     Popularity ★★★☆☆

man gave one son 10 cents and another son was given 15 cents. What time is it?

==============================================

Really Hard Riddles 2 : Famous Probability puzzle SHOOT
Difficulty ★★★★☆     Popularity ★★★★☆

Mr. Black, Mr. Gray, and Mr. White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr. Black, who hits his shot 1/3 of the time, gets to shoot first. Mr. Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr. White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr. Black, where should you shoot first for the highest chance of survival?

==============================================

Really Hard Riddles 3 : Writers Riddle
Difficulty ★★★★☆     Popularity ★★★★☆

What work can one never finish?

==============================================

Really Hard Riddles 4 : Aeroplane Hijack puzzle
Difficulty ★★★★★     Popularity ★★★★☆

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

==============================================

Really Hard Riddles 5 : Cipher Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

What does this message say?

G T Y O R J O T E O U I A B G T

Hint
Count the letters and try splitting the letters up into groups.

==============================================

Really Hard Riddles 6 : Pyramid Number Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

The below is a number puzzle. It should be read left to right, top to bottom.
1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
? ? ? ? ? ?
? ? ? ? ? ? ? ?
Question 1: What is the next two rows of numbers?

==============================================

Really Hard Riddles 7 : Unique Riddle
Difficulty ★★★★★     Popularity ★★★☆☆

What is the unique characteristic of the following words:
coughing, thirsty, defiant

==============================================

Really Hard Riddles 8 : CAT EXAM Riddle
Difficulty ★★★★☆     Popularity ★★★★☆

There is a shop that reads:
10 for \$2.00
100 for \$3.00
I needed 913 and still only paid \$3.00. How could this be financially viable for the shop-keeper?

==============================================

Really Hard Riddles 9 : What Am I Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

If you throw me from the window,
I will leave a grieving wife.
Bring me back, but in the door, and
You'll see someone giving life!

What am I?

==============================================

Really Hard Riddles 10 : Mathematical Riddle
Difficulty ★★★★★     Popularity ★★★☆☆

Using only two 2's and any combination of mathematical signs, symbols and functions can you make 5?

==============================================

Really Hard Riddles 11 : Famous Elevator Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

A man who lives on the tenth floor takes the elevator down to the first floor every morning and goes to work. In the evening, when he comes back; on a rainy day, or if there are other people in the elevator, he goes to his floor directly. Otherwise, he goes to the seventh floor and walks up three flights of stairs to his apartment.
Can you explain why?

==============================================

Really Hard Riddles 12 : Mystery Puzzle Sherlock Holmes
Difficulty ★★★★☆     Popularity ★★★☆☆

One snowy night, Sherlock Holmes was in his house sitting by a fire. All of a sudden a snowball came crashing through his window, breaking it. Holmes got up and looked out the window just in time to see three neighborhood kids who were brothers run around a corner. Their names were John Crimson, Mark Crimson and Paul Crimson.
The next day Holmes got a note on his door that read '? Crimson. He broke your window.'
Which of the three Crimson brothers should Sherlock Holmes question about the incident?

==============================================

Really Hard Riddles 13 : Which Is The Odd One Out
Difficulty ★★★★★     Popularity ★★★☆☆

Find The Odd One Out
1.FLOW
2.SNIP
3.TRAP
4.DRAW
5.BACK

==============================================

Really Hard Riddles 14 : Answer This Joke Riddle
Difficulty ★★★★☆     Popularity ★★★★★

Why is 6 afraid of 7?

==============================================

Really Hard Riddles 15 : Hard Math Riddle
Difficulty ★★★★☆     Popularity ★★★★★

Take 9 from 6, 10 from 9, 50 from 40 and leave 6.

How Come ??

==============================================

Really Hard Riddles 16 : Death Mystery Riddle
Difficulty ★★★★☆     Popularity ★★★★☆

Two men are in a desert. They both have packs on. One of the guys is dead. The guy who is alive has his pack open, the guy who is dead has his pack closed. What is in the pack?

==============================================

Really Hard Riddles 17 : Hardest Math Riddle
Difficulty ★★★★★     Popularity ★★★★★

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

==============================================

Really Hard Riddles 18 : Puzzle In A Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

What are the next two letters in the following series and why?
W A T N T L I T F S _ _
*Hint: Check Puzzle Title

==============================================

Really Hard Riddles 19 : Alexander Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

Alexander is stranded on an island covered in forest.

One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alexander survive the fire? (There are no buckets or any other means to put out the fire)

==============================================

Really Hard Riddles 20 : Challenging Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

Outside a room there are three light switches. One of switch is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb ??

==============================================

Last Updated:2012-04-21

### Logical Puzzles

Top 20 Logical Puzzles

Logical Puzzles 1 : Famous Probability puzzle SHOOT
Difficulty ★★★★☆     Popularity ★★★★☆

Mr. Black, Mr. Gray, and Mr. White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr. Black, who hits his shot 1/3 of the time, gets to shoot first. Mr. Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr. White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr. Black, where should you shoot first for the highest chance of survival?

==============================================

Logical Puzzles 2 : Challenging Puzzle

Difficulty ★★★★★     Popularity ★★★★☆

Outside a room there are three light switches. One of switch is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb ??

==============================================

Logical Puzzles 3 : Challenging Mind puzzles
Difficulty ★★★★★     Popularity ★★★★☆

You are the ruler of a medieval empire and you are about to have a celebration tomorrow. The celebration is the most important party you have ever hosted. You've got 1000 bottles of wine you were planning to open for the celebration, but you find out that one of them is poisoned.

The poison exhibits no symptoms until death. Death occurs within ten to twenty hours after consuming even the minutest amount of poison.

You have over a thousand slaves at your disposal and just under 24 hours to determine which single bottle is poisoned.

You have a handful of prisoners about to be executed, and it would mar your celebration to have anyone else killed.

What is the smallest number of prisoners you must have to drink from the bottles to be absolutely sure to find the poisoned bottle within 24 hours?

==============================================

Logical Puzzles 4 : Hardest Balance Logic Puzzle
Difficulty ★★★★★     Popularity ★★★★★

You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other.
The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more.

Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light.

==============================================

Logical Puzzles 5 : Cricket Puzzle
Difficulty ★★★☆☆     Popularity ★★★★★

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

==============================================

Logical Puzzles 6 : Unlock The Distance Puzzle
Difficulty ★★★★★     Popularity ★★★★★

Distances from you to certain cities are written below.
BERLIN 200 miles
PARIS 300 miles
ROME 400 milesAMSTERDAM 300 miles
CARDIFF ??? miles
How far should it be to Cardiff ?

==============================================

Logical Puzzles 7 : Cross Bridge Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

==============================================

Logical Puzzles 8 : Gold Bar Fewest Cut Puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

==============================================

Logical Puzzles 9 : NewsPaper Puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

A newspaper is supposed to have 60 pages
but pages 24 and 41 are missing.
Which other pages won't be there?

==============================================
Logical Puzzles 10 : Unsolvable Riddle
Difficulty ★★★☆☆     Popularity ★★★★☆

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

==============================================

Logical Puzzles 11 : Alexander Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

Alexander is stranded on an island covered in forest.

One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alexander survive the fire? (There are no buckets or any other means to put out the fire)

==============================================

Logical Puzzles 12 : Cipher Age Puzzle
Difficulty ★★★★★     Popularity ★★★★☆

If Susan is 10, Arabella is 20, and Jim and Neal are both 5, but Richard is 10, how much is Jennifer by the same system?

==============================================

Logical Puzzles 13 : February Maths Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

Using eight eights and addition only, can you make 1000?

==============================================

Logical Puzzles 14 : Famous Elevator Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

A man who lives on the tenth floor takes the elevator down to the first floor every morning and goes to work. In the evening, when he comes back; on a rainy day, or if there are other people in the elevator, he goes to his floor directly. Otherwise, he goes to the seventh floor and walks up three flights of stairs to his apartment.
Can you explain why?

==============================================

Logical Puzzles 15 : Water Jugs Problem
Difficulty ★★☆☆☆     Popularity ★★★★☆

Six jugs are in a row.
The first three are filled with coke, and the last three are empty.
By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

==============================================

Logical Puzzles 16 : Aeroplane Hijack puzzle
Difficulty ★★★★☆     Popularity ★★★★★

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

==============================================

Logical Puzzles 17 : Secret Code puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

A man wanted to get into his work building, but he had forgotten his code. However, he did remember five clues. These are what those clues were:

The fifth number plus the third number equals fourteen.

The fourth number is one more than the second number.

The first number is one less than twice the second number.

The second number plus the third number equals ten.

The sum of all five numbers is 30.

What were the five numbers and in what order?

==============================================

Logical Puzzles 18 : Challenging Logic Puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

==============================================

Logical Puzzles 19 : Popular Age Problem
Difficulty ★★★★☆     Popularity ★★★★★

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you man?
Bill: Not bad, got married and I have three kids now.
Jack: That’s awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool… But I still don’t know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh now I get it.

How old are Bill’s kids?

==============================================

Logical Puzzles 20 : Water Pails Puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

If you had an infinite supply of water and a 5 quart and 3 quart pails, how would you measure exactly 4 quarts? and What is the least number of steps you need?

==============================================

Last Updated:2012-04-21

### Murder Mystery Puzzle

Murder Mystery Puzzle - 20 April

A wealthy man lives alone in a small cottage. Being partially handicapped he had everything delivered to his cottage. The mailman was delivering a letter one Thursday when he noticed that the front door was ajar. Through the opening he could see the man's body lying in a pool of dried blood. When a police officer arrived he surveyed the scene. On the porch were two bottles of warm milk, Monday's newspaper, a catalog, flyers, and unopened mail. The police officer suspects it was foul play. Who does he suspect and why?

### Equation Riddle

Equation Riddle - 19 April

ABCDEFGH*H=AAAAAAAAA
What is H?

### Relationship Riddle

Relationship Riddle - 18 April

That attorney is my brother, testified the accountant.
But the attorney testified he didn't have a brother.
Who is lying?

### Comedy Riddle

Comedy Riddle - 17 April

Why are televisions attracted to people ?

### Puzzle Of Math

Puzzle Of Math - 16 April

At a local village gala, the entire population turned up, 500 people. The event raised £3,000. Tickets were priced as follows:
£7.48 men
£7.12 women
£0.45 children.
How many men,women and children were there?

### Top 20 Cool Puzzles

Cool Puzzles 1 : Unlock The Distance Puzzle
Difficulty ★★★★★     Popularity ★★★★★

Distances from you to certain cities are written below.
BERLIN 200 miles
PARIS 300 miles
ROME 400 milesAMSTERDAM 300 miles
CARDIFF ??? miles
How far should it be to Cardiff ?

==============================================

Cool Puzzles 2 : What Am I Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

If you throw me from the window,
I will leave a grieving wife.
Bring me back, but in the door, and
You'll see someone giving life!

What am I?

==============================================

Cool Puzzles 3 : Pyramid Number Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

The below is a number puzzle. It should be read left to right, top to bottom.
1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
? ? ? ? ? ?
? ? ? ? ? ? ? ?
Question 1: What is the next two rows of numbers?

==============================================

Cool Puzzles 4 : Challenging Logic Puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

==============================================

Cool Puzzles 5 : Trick Question
Difficulty ★★★☆☆     Popularity ★★★★☆

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

==============================================

Cool Puzzles 6 : Maths Joke Puzzle
Difficulty ★★☆☆☆     Popularity ★★★★☆

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

==============================================

Cool Puzzles 7 : Puzzle In A Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

What are the next two letters in the following series and why?
W A T N T L I T F S _ _
*Hint: Check Puzzle Title

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Cool Puzzles 8 : Cipher Age Puzzle
Difficulty ★★★★★     Popularity ★★★★☆

If Susan is 10, Arabella is 20, and Jim and Neal are both 5, but Richard is 10, how much is Jennifer by the same system?

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Cool Puzzles 9 : Popular Age Problem
Difficulty ★★★★☆     Popularity ★★★★★

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you man?
Bill: Not bad, got married and I have three kids now.
Jack: That’s awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool… But I still don’t know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh now I get it.

How old are Bill’s kids?

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Cool Puzzles 10 : November Maths Puzzle
Difficulty ★★☆☆☆     Popularity ★★★★☆

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

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Cool Puzzles 11 : Cipher Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

What does this message say?

G T Y O R J O T E O U I A B G T

Hint
Count the letters and try splitting the letters up into groups.

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Cool Puzzles 12 : Cross Bridge Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

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Cool Puzzles 13 : Brain Twister Puzzle
Difficulty ★★★★☆     Popularity ★★★★★

2+3=8,
3+7=27,
4+5=32,
5+8=60,
6+7=72,
7+8=??

Solve it?

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Cool Puzzles 14 : Gold Bar Fewest Cut Puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

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Cool Puzzles 15 : Complete The Equation
Difficulty ★★★☆☆     Popularity ★★★★★

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

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Cool Puzzles 16 : Water Pails Puzzle
Difficulty ★★★☆☆     Popularity ★★★★☆

If you had an infinite supply of water and a 5 quart and 3 quart pails, how would you measure exactly 4 quarts? and What is the least number of steps you need?

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Cool Puzzles 17 : Find The Next Number
Difficulty ★★★★★     Popularity ★★★★☆

What are the next three numbers in this series?

4, 6, 12, 18, 30, 42, 60, 72, 102, 108, ?, ?, ?

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Cool Puzzles 18 : Weighing Balance Puzzle
Difficulty ★★★★☆     Popularity ★★★★☆

You can place weights on both side of weighing balance and you need to measure all weights between 1 and 1000. For example if you have weights 1 and 3,now you can measure 1,3 and 4 like earlier case, and also you can measure 2,by placing 3 on one side and 1 on the side which contain the substance to be weighed. So question again is how many minimum weights and of what denominations you need to measure all weights from 1kg to 1000kg.

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Cool Puzzles 19 : Brilliant Student Puzzle
Difficulty ★★★☆☆     Popularity ★★★★★

There was once a college that offered a class on probability applied to the real world.The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it.When everyone received the test it was a blank sheet of paper with a solitary question on it: 'What is risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

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Cool Puzzles 20 : Eight 8 Add Puzzle
Difficulty ★★★☆☆     Popularity ★★★★★

Can you add eight 8's together so they add up to an even one thousand ?

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Last Updated:2012-04-15

### Whos the Youngest Puzzle

Who's the Youngest Puzzle - 14 April

Bipasha is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named Lucian, who is older than Bipasha, who's youngest?

### A Counting Puzzle

A Counting Puzzle - 13 April

If you wrote all of the numbers from 300 to 400 on a piece of paper, how many times would you have written the number 3?

### Complete The Equation

Complete The Equation - 12 April

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

### Puzzle Of Maths

Puzzle Of Maths - 11 April

In a stable there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

### Next Number In The Series Hardest

Next Number In The Series Hardest - 10 April

What is the next number in this series?
6, 14, 36, 98, 276, ?

### What Are We

What Are We - 9 April

We can be boring,
Or interesting.
We can be long,
Or short.
We can have pictures,
Or just words.
Many love us,
But many also hate us.

What are we?

### Who is the oldest Puzzle

Who is the oldest Puzzle - 7 April

Kareena is older than Bipasha. Bipasha is younger than Karishma and younger than Katrina. Katrina is older than Kareena and Alonso, who are older than Karishma.If Alonso and Kareena are twins, who's oldest?

### Tricky Riddle

Tricky Riddle - 6 April

How many times can you subtract 5 from 25?

Eight 8 Add Puzzle - 5 April

Can you add eight 8's together so they add up to an even one thousand ?

### Identify The 4 Numbers

Identify The 4 Numbers - 4 April

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

### What Am I Puzzle

What Am I Puzzle - 3 April

If you throw me from the window,
I will leave a grieving wife.
Bring me back, but in the door, and
You'll see someone giving life!

What am I?