Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

What can you catch but never throw?

What does the below mathematical rebus mean?

When it's bad luck to meet a black cat?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?

A woman lives in a Tall building thirty-six floors high and 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?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

How many triangles are there on the puzzle below?

Who has married many women but was never married?