If eleven plus two equals one, what does nine plus five equal?

Solve below rebus puzzle?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

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?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

What is the longest word in the dictionary?

The answer I give is yes, but what I mean is no. What was the question?

If your uncle’s sister is not your aunt, what relation is she to you?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?