Question

Sarah used 2.5 cups of cheese in a dish that serves 10 people.Amy used 1.6 cups of cheese in a dish that serves 8 people. How much more is in sera’s dish

Answer 1

Not EXACTLY sure what you're looking for here, but I found the amount of cheese per person in Sarah's dish and in Amy's dish.  For Sarah's dish, each person is getting $\frac{2.5}{10} = \frac{1}{4}cup$.  In Amy's dish, each person is getting $\frac{1.6}{8} = \frac{1}{5}cup$.  Each person eating Sarah's dish is getting 1/20 cup more cheese than each person eating Amy's dish.  Like I said, not sure exactly what you're looking for, but that's a start! ; )