What is the coolest letter in the alphabet?

Can you write down eight eights so that they add up to one thousand?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

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

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

What is the largest number you can write with just 3 digits?

What is the fastest way to double your money?