Answer:
0.12 cups
Step-by-step explanation:
What we need to get here is the proportion of cheese in each dish. This implies the ratio of cheese per dish.
Sarah used 2.5 cups for 10 people, which means 2.5/10 cups of cheese per dish. 2.5/10= 0.25
So, Sarah gave 0.25 cups of cheese to each dish.
If we make the same calculation for Aron, we have 1.6/12=0.13
Arun used 0.13 cups of cheese per dish.
For getting the difference we just need to subtract:
0.25-0.13=0.12
So, Sarah used approximately 0.12 cups of cheese per dish more then Arun.