What does below rebus means ?

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?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

The more it dries, the wetter it becomes. Can you tell what it is?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

I have an eye but still cannot see.

Who am I?

Spot what is wrong here in below Picture?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

If your uncle’s sister is not your aunt, what relation is she to you?

How can you write nineteen in a manner that if we take out one, it becomes twenty?