No this isn't a dirty topic. I'm talking about making up those Brain Teasers Greg used to put up. I tried making one today. I'll admit I only spent about 15 minutes writing it, but I thought I had it narrowed down so there was only one possible answer. Now I'm seeing multiple answers and I can't find anything wrong with them. I'd like some feedback if I could get some. Was this a good brain teaser (other than the fact that I totally screwed it up) was the difficulty level about right or was it too easy or too hard or too verbose?