A correct solution came from Bradley student Will Cragoe. Other correct solutions were submitted by Nancy Scharzkopf, Lou Cairoli, Ahron Teitelman, Steven Prowse, Ed Sun, Matt Millward, Juan Carlos Marivela, Siu Por Lam.
As several correspondents pointed out, I had previously posted this same problem as POTW 200. While they remembered, I had not. Check out the previously posted solution.
©2005 Alberto L. Delgado