What's the only room from which no one can enter or leave

John is the son of Jacob.
So,
Jacob is the_____of John's father?

You can see three almost identical images below. Can you spot the odd one out from them?

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?

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 ?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

Can you find a five letter word that is left with only two letters if one is removed?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

The more it dries, the wetter it becomes. Can you tell what it is?