What does this rebus puzzle means ?

A woman lives in a Tall building thirty-six floors high and 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?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

When can we add 2 to 11 and get 1 as the correct answer?

What is the word or phrase?

Identify the 10 differences between the two given pictures.

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

What has lots of eyes, but can’t see?

Can you name an animal whose killing cannot be performed without spilling your own blood?