If 21x = 79x, what is the value of x?

There is something which you can be arrested for attempting but not for successfully completing.

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?

Can you find the mistake in the below statement?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

What is always in front of you but can’t be seen?

Which number should replace the question mark?