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

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

What jumps when it walks and sits when it stands?

What does below rebus means ?

What will you call your mother's brother's brother-in-law?

Can you identify the hidden rebus in the image below?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

What am I?