Good Riddles

Question: You can only keep it once you give it to somebody.

What is it?

Question: What's the difference between a well-dressed man on a bicycle and a poorly-dressed man on a tricycle?

Question: There are 6 sisters. Each sister has 1 brother. How many brothers are in the sisters' family?

Question: Imagine that you enter a room, but the door shuts behind you and you are locked inside. The room is 3 meters high, and 6 meters x 6 meters as a square form. It is dark, the floor is metal just like the walls and the ceiling. You cannot destroy the walls, ceiling, floor or door. How to you get out?

Question: Which triangle will have a larger perimeter : 3,4,5 or 3,4,7 ?