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 points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

There was a strange boy who was born before his father. How can this be possible?

I have an eye but still cannot see.

Who am I?

What work can one never finish?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?