What happened when the wheel was invented?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

what's the probability of getting a king or a queen from a pack of 52 cards?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

What is the end of everything?

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

O_er_t_o_

Complete the missing letters of the given word.