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 number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

How many triangles are there on the puzzle below?

What is at the end of a rainbow?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

what does this below rebus represent identXQQQQQME