What does this mathematical rebus means ?

What number divided by 4 is the same as that number minus 4?

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?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

When we see 2 but call 10?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

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

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

An ant is travelling on a 1-meter-long rope at 1 cm/second but also the entire rope is being stretched by an extra 1 meter/second. Is it possible for the ant to reach at the end of the rope?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?