A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

The centre of the third figure is empty. What digit should fit inside?

What has one eye, but can’t see?

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

Which digit occurred maximum times between the number 1 and 1000?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

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

I look at you, you look at me, I raise my right, you raise your left. What am I?