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

No matter how little or how much you use me, you change me every month. What am I?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

What goes through cities and fields, but never moves?

What runs around the whole yard without moving?

What is more useful when it is broken?

Can it be possible to build a house that has all its four walls facing towards the South?

There are forty elephants and they have forty-fore heads. How can this be possible?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?