How can a man go eight days without sleep?

Remove two matchsticks to make the below equation correct.

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

Prove that twice of ten is the same as twice of eleven.

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

In the image below, can you find the value of an angle(y)

What has a bottom at the top?