The ratio of cheese to sauce for a single pizza is 1 cup to 1/2 cup. If Rama used 15 cups of sauce to make a number of pizzas, then how many cups of cheese did she use on those pizzas?

The given ratio of cheese to sauce is:
Ratio=
Sauce
Cheese
​
=
2
1
​

1
​
=
1
2
​

This means that the amount of cheese used is always twice the amount of sauce used.

Given that the amount of sauce used = 15 cups

Therefore, the amount of cheese used is:

Cheese=2×Sauce=2×15=30 cups