This is a highly challenging, well-known logic problem, said to have possibly been created by Albert Einstein or Lewis Carroll. You can provide students with the manipulatives to help them solve the problem, or let them develop a way to solve it on their own. Students will engage in critical thinking and employ several mathematical practices to solve the problem.When you purchase this item from me, this printable has an answer key and manipulatives that can easily be turned into a math or readin