When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What has a bottom at the top?

You need to move three matchsticks to form three squares. Can you do it?

You are trapped into a death trap by the famous jigsaw killer. As usual, a screen flashes in front of you and explains you the trap game. There are 100 pearls kept in a bowl in front of you and an empty bowl. Among the 100 pearls, 50 are white and 50 are black. You can divide them as you like into the two bowls. Once you are done, you will pull a lever, which will turn the room pitch black. The bowls will move and shuffle around. In the dark, you have to pick up one pearl from any bowl. Once you do that, the room will flood with lights again. If the peral you have in your hand is white, you will be allowed to live, but if the pearl you picked is black, the room will be filled with poisonous gas and you will die. How will divide the pearls to increase your chances of survival?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Count the Triangle in the figure given below:

Which flower has two lips?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

Can you start the fire using two pieces of wood?