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

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

The more of this there is, the less you see. What is it?

What makes this number unique: 8,549,176,320?

What do you answer even though it never asks you questions?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Forwards I am heavy, backward I am not. What am I?

What is the longest word in the dictionary?

What do you call a fish without an eye?