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

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

What is next number in the pattern below:

131 517 192 123 ?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

What is the word or phrase below?
R | E | A | D

What jumps when it walks and sits when it stands?

Buy me, smell me or deliver me, I do not change.

Who am I?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???