It belongs to you, but other people use it more than you do. What is it?

What does it mean?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

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?

Why Aeroplane windows are round?

Find the next number in the series.
1 10 24 43 67 ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What is next number in the pattern below:

131 517 192 123 ?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.