Tuesday, March 8, 2011
Problem Solving: Working Backwards
Bake Sale challenges students to work backwards to figure out how many cookies the girls actually baked for the school bake sale. They left the cookies on cooling racks, but each got up at different times throughout the night, ate some cookies, then packaged some others to take home. Lo and behold there are only 10 cookies left in the morning. Each girl admits eating a few during the night but there are a lot of cookies missing. Students must work backwards to figure out how many cookies they originally baked, then decide how many cookies each girl got and whether or not the cookies were fairly split.
Download the Bake Sale problem with possible solution.