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.

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

Our product and our sum always give the same answer. Who are we?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

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

I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you find out the remainder when 3^300 is divided by 5?

What Does this text mean:

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