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?

Prove that twice of ten is the same as twice of eleven.

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

Can you replace the question mark with the correct number in the below table sequence?

Do You See It?

John was piloting a plane behind a car but was never able to overtake it. Why?

What happened when the wheel was invented?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

I add 5 to 9 and get 2. The answer is correct, so what am I?