I was studying an Iranian olympiad book problems then I faced a very intersting puzzle, I wanted to solve this but faced lots of problems. I'd like to share this with you and know your mind.
We have divided the following figure garden into two areas with fences.We have drawn the fences on a simple and closed curve. Only three parts of the garden are known and the rest of the garden is covered with trees. Three cats are waiting for the mice. All three are in the outer area and can not cross the fence. How many mice might be trapped? (Iranan Math Olympiad).