Why is the Hole below a Lock?

Identify the hidden meaning behind this picture?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

Find the number of squares in the below-given picture.

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

How many letters are in the alphabet?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What is black when you buy it, red when you use it, and gray when you throw it away?

Who are the happiest people in IPL match?

Can you find the key in the picture below?