Which word does the below Plexor means ?

What happened when the wheel was invented?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

Can you replace the question mark with the correct number?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

What has a bottom at the top?

Find out the number of circles in the given picture having Illusion

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?