Good Riddles

 

Question: What single line can you add to the following statement to make it true?

5+5+5=550

Question: A man wants to buy a used car. He finds a beautiful Buick for $9500, but he buys it without paying a dime.

How did he manage this?

Question: Half of those who read this riddle, I am your best friend.
I depend on you, but it's you I will defend.

What am I?

Question: If a white house is white and a yellow house is yellow, what color is a green house?

Question: What goes up and down the stairs without moving?