What always comes into a house through the keyhole?

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?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What is black when you buy it, red when you use it, and gray when you throw it away?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Which point will the car reach to go out?

Why did Buffon take the goal with him after every Juventus match?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?