You calculate the ratio of x to y by simply dividing teh x quantity by the y quantity. You can then sort the results in order from highest to lowest ratio. For example, Jim's ratio is 10/1 = 10, and Sara's is 10/2 = 5, so you would place Jim above Sara. As for Chip, his ratio is 1/0 = , so he goes above Jim. Can you figure out where Deb belongs on the list?