How can you take 2 from 5 and leave 4?

How many times can you subtract the number 5 from 25?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

If a wheel has 54 spokes, how many spaces are there between the spokes?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

Do You See It?

I am the fastest animal but cannot climb the tree. What am I?

I have no life, but I can die. What am I?