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!!!

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Bay of Bengal is in which state?

If 21x = 79x, what is the value of x?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

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

What is black when you buy it, red when you use it, and gray when you throw it away?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

As shown in the picture below, we can see a boy hanging on the tree branch to save his life. There are various ways in which he can die like1. A snake hanging toward the right waiting to bite the boy.2. A roaring Lion near the tree.3. Two crocodiles are ready to attack if the boy reaches near water. The tree is chopped to some extent, so can fall as if he moves a lot. Can you give this boy an escape plan?