How many sides does a circle have?

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

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

How can you leave a room with two legs and return with six legs?

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

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

A man was found murdered on Sunday morning. His wife immediately called the police. The police questioned the wife and staff and got these alibis: The Wife said she was sleeping. The Cook was cooking breakfast. The Gardener was picking vegetables. The Maid was getting the mail. The Butler was cleaning the closet. The police instantly arrested the murderer. Who did it and how did they know?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

What has hands, but can’t clap?

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