I was reviewing old blog posts and came across one about the Fido Puzzle.  For their “sharing time” my 5th graders have recently been trying to stump each other with riddles, and I think this might be a good one to add to the mix.  (If you are a parent of one of my 5th graders, don’t show them the answer!)

My original post did not include an explanation, but I’m getting kinder in my old age;)