Solution at the bottom of this page.
Like this problem? Try our Contest Problem Book series!
Thanks to all who participated in MAA's annual T-Shirt Design Contest. We received many creative entries this year. Check out the top three here http://on.fb.me/12kalpg and cast your vote for this year's t-shirt. Vote here:http://on.fb.me/12bicEt. Voting ends July 12 at midnight.