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!!!

What is always in front of you but can’t be seen?

Find the missing letter in the last circle logically in the given below picture.

Bay of Bengal is in which state?

Can you find a five letter word that is left with only two letters if one is removed?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Take one out and scratch my head, I am now black but once was red. What am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13