John is the son of Jacob.
So,
Jacob is the_____of John's father?

Replace the question mark with the number below given a simple math problem.

Why is the Hole below a Lock?

Prove that twice of ten is the same as twice of eleven.

why number 8549176320 is one of a kind?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?