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

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

What is common among 11, 69, and 88?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

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

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What can you catch but never throw?

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

What came first, the chicken or the egg?