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

Count the number of lines in the image below ?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

A man dies of old age on his 25 birthday. How is this possible?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?

81 x 9 = 801. What must you do to make the this equation true?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?