What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

The centre of the third figure is empty. What digit should fit inside?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

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

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.