Can you find out who is the kidnapper in below Picture and why, Explain ?

How can you take 2 from 5 and leave 4?

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?

The dirtier I get, the whiter I look. Who am I?

What two things can you never eat for breakfast?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What am I?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?