Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

What does it mean?

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

Find the next number in the sequence

1, 2, 6, 21, 88, __?

What you cannot hold but it is yours?

Can you name an animal whose killing cannot be performed without spilling your own blood?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

If eleven plus two equals one, what does nine plus five equal?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?