Logic Riddles

Question: A man lived on the 12th floor of a building it was a nice building anyway when he goes to work he gets in the elevator and goes to the bottom floor. When he comes back he goes to the 7th floor and walks the rest. But when there is someone else in the elevator he goes to the 12th and when it is raining why.

Question: What is something you'll never see again?

Question: There are two boys at an international math contest in December 2013; one is British and one is American. They both write their names, the date, and their answers on the paper. The only problem is that they both have the same name and the papers cannot be told apart.

What is the date?

Question: Most people are born on one, die on one, and experience some of their most blissful moments upon it.

Question: The warden of a circular jail is extremely hyper one day so he begins running around opening cells. The jail has 100 cells numbered from 1 to 100. He runs in a circle and opens all of the cells. Next he runs around and closes every 2nd cell (starting with cell 2, 4, 6 , etc.). If a cell is open he closes it and if a cell is closed he opens it. When he finishes running by all 100 cells he opens/closes every 3rd cell (starting with 3, 6, 9, 12 etc.), then every 4th cell (starting with 4, 8, 12, etc.) and so on. He does this until he goes around and only changes the 100th cell.

When he is done what cells will be open?