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?

How many sides does a circle have?

What runs around the whole yard without moving?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Can you find out the number that should replace the question mark with a valid reason?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

Which number should replace the question mark?

Move four matchsticks to the below square to form three squares?

Find out the missing number in the picture attached: