What is the coolest letter in the alphabet?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

What is more useful when it is broken?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

A dying old man wants to divide his entire land between his only two sons. Since his only wish is to treat them as equal as both of them have been too good to him, he wants to divide his land equally between them. The problem is that the land is significantly irregular in shape and thus there is no choice of cutting them into two equal halves.

Can you help him divide the land in a manner that both of his sons will be happy?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?