@Etesian and Nick : Yup that works.
To Nick's riddle :
(I've seen this one before)
My next riddle: A teacher wanted to check the intelligence of 3 of her students. She tells them to sit in a triangle so each one can see the other 2. She tells them to close their eyes. She tells them 'I am going to place a blue or red cap on all 3 of you. When i tell you to open your eyes, you have to raise your hands if you see a blue cap'. She places a blue cap on all 3 of them.When they open their eyes, all 3 of them raise their hands. Shortly afterwards, one boy says 'I have a blue cap'. How did he come to this conclusion?