A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

What does it mean?

Take away the whole and some still remain. What is it?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?