Replace the question mark with the number below given a simple math problem.

Aman has 1.15 rupees in his pocket. There are a total of 6 coins in his pocket.

When his friend asked him for a change, he could not give change for a rupee and five paisa.

Can you tell which coins he has?

Can you count the number of blocks in the picture below?

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

Take away the whole and some still remain. What is it?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

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 ?

Find the Goldfish below the given Image.

I have eight fingers and two thumbs but I do not live. What Am I?

Give it food and it will live; give it water and it will die.