I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

How can a man go eight days without sleep?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

Which point will the car reach to go out?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?