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 ?

Which number should replace the question mark?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Can you count the number of squares in the figure below?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

How can one talk without saying a single word?

I cannot talk, but I always reply when spoken to. What am I?

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