Part a. To find the number of coups that Sara used per person, we need to divide the number of cups by the number of people. In Sara's case 3.6 by 12:
a. Sara used 0.3 cups of cheese per person
Part b. We do the same for Amyn, since she used 2.8 cups for 7 people, we divide 2.8 by 7 to find the number of cups per person:
b. Amyn used 0.4 cups of cheese per person
Part 3. To find the difference in the cheese that they used, we subtract the quantities:
Amyn puts more cheese in one serving because Sara used 0.3 per person, and Amyn 0.4 per person, which is 0.1 more cheese