#21 - Water Jug Puzzle

There are 4 water jug – A, B, C and D.
One can fill 3 litres in A, 4 litres in B, 5 litres in C and 5 litres in D. Container A and B are given to you empty and C and D are fully filled with water.

What you have to do is fill the water jug A, B, C and D with ascending or descending order.

Water Jug Puzzle
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Initially
A – 0, B – 0, c -5, D – 5

Pour C into B
A – 0, B – 4, C – 1, D – 5

Pour C into B
A – 0, B – 4, C – 1, D – 5

Pour half of B into C
A – 0, B – 2, C – 3, D – 5

Pour D into A
A – 3, B – 2, C – 3, D – 2

Pour A into B
A – 1, B – 4, C – 3, D – 2

Pour half of B into D
A – 1, B – 2, C – 3, D – 4

#22 - Worlds Best Paradox Riddle

Outside a tattoo artist's shop there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself ?

Worlds Best Paradox Riddle
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Well this is a paradox sentence which does not have any specific answer.

#23 - Hard Mathematics Expression Puzzle

You are given with six numbers – 1, 2, 3, 4, 5 and 6. You can arrange them in any order and you can use all the four mathematics expression i.e. add, subtract, multiply and divide and also parenthesis. The result must be 278.

There are three other rules
1) You can only use a number once.
2) It is not compulsory to use all the six numbers.
3) You can't join numbers i.e. you can't use 1, 2 and 3 as 123.

Hard Mathematics Expression Puzzle
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(1 + (3 + 4*5)*6)*2

There can be more than one possibilities.

#24 - Hard Chess Count Puzzle

Can you count the number of rectangles in a chess board ?

Hard Chess Count Puzzle
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1296

#25 - Solve Mathematical Problem

There are two insects on a tile. Insect X is sitting on one side of the tile (point A) and Insect Y is sitting opposite on the other side of the tile (point B). Now both of them decide to change their position and thus X starts crawling to point B and Y starts crawling to point A. When they meet and pass each other in between, X takes 20 seconds to reach to B and Y takes just 5 seconds to reach A.

Can you calculate the total time each of the insects took to change their positions?

Solve Mathematical Problem
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Assume that P is the speed of Insect X and Q is the speed of Insect Y.
Let T be the number of seconds it takes them to cross paths.
Now Distance = Speed * Time

Thus for Insect X
Distance = P * T before meeting
And Distance = P *20 after meeting

For Insect Y
Distance = Q * T before meeting
And Distance = Q * 5 after meeting

Now the distance travelled by X before meeting is equal to the distance travelled by Y after meeting and vice versa

Thus
P * T = Q * 5
And Q * T = P * 20

Solving both equations, we get T = 10

Thus Insect X requires 10 + 20 = 30 seconds,
Whereas Insect Y requires 10 + 5 = 15 seconds to change the position.

#26 - Easy Maths Rebus Riddle

What does this rebus riddle means ?

Easy Maths Rebus Riddle
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To Infinity and beyond

#27 - Rebus Math Riddle

What does this maths rebus means ?

Rebus Math Riddle
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absolutely not

#28 - Horse Wind Puzzle

Emily learnt how to ride a horse recently. Just to test her skills, she rode the horse from her home till a mine which she covered in three minutes and returned back home from the same path only this time she took four minutes. The reason was that while riding away from home, she was supported by wind however while riding back, she was riding against the wind.

How fast do you think she could have rode a mile if there was no wind ?

Horse Wind Puzzle
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3 minutes and 25 5/7 seconds.

The most common way how most of people see this problem is adding 3 and four to obtain 7 and they believe it should give a correct average and thus her time should be taken to 3 and half minutes. But if you do like that, you will get to a wrong answer. This is because, the wind has only helped her for three minutes while it has worked against her for four minutes.
If she could ride a mile in three minutes with the wind, it is evident that she could go a mile and 1/3 of a mile in four minutes. Thus two and 1/3 miles in eight minutes will give her actual speed as the wind has helped her as much as it has worked against her.

Thus her actual time for a single mile without wind will be 3 minutes and 25 5/7 seconds.

#29 - Mathematical Rebus Puzzle

what does below mathematical rebus means ?

Mathematical Rebus Puzzle
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glass ceiling

#30 - Easy Math Rebus Puzzle

what does the below math rebus puzzle means ?

Easy Math Rebus Puzzle
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ground floor