Which is the smallest number that you can write using all the vowels exactly once?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?

Look at the picture and find out which square is not linked with any of the other squares.

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What does this mean?

CCCCCCC

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?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What work can one never finish?