What happened when the wheel was invented?

You can hear me, but you can't touch or see me.

What am I?

What has one letter and starts with an E?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

If eleven plus two equals one, what does nine plus five equal?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

Why Aeroplane windows are round?

When is the top of a mountain similar to a savings account?

Count the squares in the matchstick puzzle below?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day