As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

I have Rs.50 and I spend it in the way as below.

What will you call your mother's brother's brother-in-law?

How many bananas can you eat if your stomach is empty?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?