Answer:
0.25 cups of cheese are needed for 1 serving of Sarah's dish
Explanations:
The number of cups of cheese Sarah used to serve 10 people = 2.5 cups
The number of cups of cheese Arun used to serve 8 people = 1.6 cups
The number of cups sarah needs to serve 1 person = 2.5 /10
The number of cups Sarah needs to serve 1 person = 0.25
0.25 cups of cheese are needed for 1 serving of Sarah's dish