Move four matchsticks to the below square to form three squares?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

Replace the question mark with the correct number.

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

Who has married many women but was never married?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

What can you hold in your right hand, but never in your left hand?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?