Elementary Math Puzzles

#31 - Simple Simple Google Interview Puzzle

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.

#32 - October Train Puzzle

An express train takes 3 seconds to enter tunnel which is 1 km long.
If it is traveling at 120 km an hour, how long will it take to pass completely through the tunnel

#33 - Maths Quiz

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?

#34 - Who is the oldest Puzzle

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?

#35 - Logic Riddle

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

#36 - Cool Maths Puzzle

Divide 110 into two parts so that one will be 150 percent of the other. What are the 2 numbers?

#37 - Maths Problem

The sum of a mother, her baby and her dog weight is 170 pounds.How much does the baby weigh if the mother weighs 100 pounds more than the combined weight of the baby and the dog,and the dog weighs 60 percent less than the baby?

#38 - Number Riddle

What number divided by 4 is the same as that number minus 4?

#39 - Mathematics Puzzle

Lavesh can paint a a house in just 3 hours.However it takes 6 hours for vishesh to complete the same job.
How long would it take for both to complete the same job?

#40 - Maths Wimbledon Matches Problem

In 2012 Men's Wimbledon , 80 tennis player from across the world have come to participate.
As we know its a knock-out tournament , each player is eliminated as soon as he looses a match.

The organizer of the tournament decides to count the minimum number of required matches.

Can you help them out ?