I have an eye but still cannot see.

Who am I?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What does does this rebus picture means ?

What is the word or phrase below?
R | E | A | D

Can you count the number of triangles in the picture below?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

What do you call a fish without an eye?