If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

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

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

No matter how little or how much you use me, you change me every month. What am I?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

What word begins and ends with an E, but has only one letter?