Riddles

These are different riddles that I have picked up over the years. I've gotten most of them from books and different websites. A few I've gotten in conversation or have made up myself. Most of them tend to be mathematical in nature. Have fun. If you make a comment please do so as a non-member and send me your e-mail. MAKE SURE TO BE LOGGED OUT! and not just checked as someone else. I'll be notified in my e-mail. I won't be posting the comments later so don't worry. I can't prevent members from posting and I don't want to ruin the fun for others nor do I want to be giving out e-mail addresses willy-nilly. Thank you!