Peter, Samuel, and Rebecca made cookies. Each of them made a different cookie shape. Then they sampled the cookies.

Peter ate 2 and 1 .

Samuel ate 1 , 1 , and 1 .

Rebecca ate 1 and 2 .

When they were done eating, there were 5 of Peter’s cookies left, 3 of Samuel’s, and 7 of Rebecca’s.  What cookie shape did each make?

(solution)