What is the fastest way to double your money?

What is the next number in this series?

4,12,84,3612....

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

What does this below rebus puzzle mean?

Replace the question mark with the correct number in below Picture:

Find the smallest sentence with all the English alphabet.

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

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

An old Woman left INR 33,333 to be divided equally among two fathers and two sons and each was to receive INR 11,111.
How was this possible?