I am white when I am dirty, and black when I am clean. What am I?

John walks into the daily grocery shop and steals a $100 bill from the shop. An hour later John returns to the shop and buys some daily products for $40. John pays the owner the $100 bill and therefore the owner returns him $60.

How much money did the owner lose?

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

What number do you get when you multiply all of the numbers on a telephone's number pad?

Solve the equation in the image by looking at the pattern closely.

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

What Time Should the last watch show in the below figure?

Can anyone tell me a word in the English dictionary which has a silent 'z'?