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

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Find the last number in the series below:

voN luJ yaM raM ---

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

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

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A shopkeeper allows people to buy a cold drink bottle in exchange for five empty bottles. A guy had a party at home and spent 77 cold drink bottles at the party. Now he has 77 empty bottles with him.

How many bottles do you think he can buy in exchange for those 77 empty bottles?

Which famous Hollywood movie name is hidden in the below rebus?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?