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

What is the next number in the series?

15 29 56 108 208 ?

What does this mathematical rebus means ?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

If eleven plus two equals one, what does nine plus five equal?

A rain drop fell from one leaf to another leaf and lost 1/4th of its volume. It then fell to another leaf and lost 1/5th of the volume. It again fell on another leaf and lost 1/5th of the volume.



This process kept repeating till it fell on the last leaf losing 1/75th of its volume.



Can you calculate the total percentage of loss from the initial volume when the drop has fallen to the last leaf accurate up to two decimal places?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

There is a place where if I stand up straight, I will still be considered sideways.

Replace the question mark with the correct number in the below-given picture?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.