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.

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Replace the question mark with the correct number below.

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

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?

What has many keys but can’t open a single lock?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Keyboard words are not in alphabetical order, Why?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??