You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

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?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

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

Identify the hidden meaning behind this picture?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

What has 88 keys?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.