What is the fastest way to double your money?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

Who is that with a neck and no head, two arms and no hands? What is it?

I have teeth but i don't bite. Who Am I ?

Do You See It?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

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 am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What occurs twice in a week, once in a year but never in a day?