Prove that the below maths equation is true.

8 + 8 = 91

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

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Name a key which is hardest to turn.

By moving just one matchstick, you need to make the below statement true. Can you do it?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Whats the next number in the below number sequence pattern.

What does this rebus riddle mean?