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!!!

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

Which letter of the alphabet has the most water?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What runs around the whole yard without moving?

What is common among 11, 69, and 88?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

What can go up a chimney down, but can’t go down a chimney up?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?