A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

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?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

How many times can you subtract the number two from the number fifty?

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?

How many sides does a circle have?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?