A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Look at the picture and find out which square is not linked with any of the other squares.

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Can you count the number of matches in the picture below ?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

A woman is sitting in her hotel room and hears a knock at the door. She opens the door to see a man whom she’s never met before. He says, “I’m sorry, I have made a mistake, I thought this was my room.” He then goes down the corridor and into the elevator. The woman goes back into her room and calls security. What made the woman so suspicious of the man?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?