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

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Can you find the hidden animal in the picture below?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Count the squares in the matchstick puzzle below?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?