A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Different lights make me strange by changing me into different sizes. What am I?

Can you find out the total number of triangles in the given figure?

What goes up but never comes down?

When we see 2 but call 10?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?