Replace the question mark with the correct number in below Picture:

The Little ant seems to be always confused. Do you know why?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

What does Alexander the Great and Winnie the Pooh have in common?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?