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

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I am quite hot but become too cold if you remove the first two letters. What am I?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

Find the next number in the following series:
6, 14, 26, 98, __?

A father's child, a mother's child, yet no one's son.

Who am I?

Which is heavier: a ton of bricks or a ton of feathers?