Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

The more you take me, the more you leave me behind.
Who Am I?

Who are the happiest people in IPL match?

I can be cracked, made, told, and played. What am I?

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?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?