How can a man go eight days without sleep?

I have Rs.50 and I spend it in the way as below.

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

When 99 is considered higher than 100?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

Find the missing number in the sequence below:

During which month do people sleep the least?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

What can you deduce from the following BrainBat?

CRY
LMKI

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.