A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Rearrange the letters in "new door" to make one word.

A father's child, a mother's child, yet no one's son.

Who am I?

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

There is an ancient kingdom where every married woman keeps information regarding the fidelity of other men. However, what they don't know is the fidelity of their own husbands. Also, there is an ancient belief that they don't tell each other about the fidelity of their husbands.

On a certain day, the queen of the kingdom declares that she has identified at least one unfaithful man in the kingdom. She allows the wives to identify and gives them authority to kill their husbands if they are unfaithful at midnight.

How will the wives manage it?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

Can you find out the missing number in the grid?