The ratio of cheese to sauce for a single pizza is 1 cup to $$\frac 12$$​cup. If Rama used 15 cups of sauce to make a certain number of pizzas, then how many cups of cheese did she use on those pizzas?

Correct option is A

Given:
Ratio of cheese to sauce = 1 : $$\frac 12$$​= 2 : 1
Sauce used = 15 cups
Solution:
If cheese : sauce = 2 : 1, then cheese = 2 × sauce.
So, Cheese = (2 × 15) = 30 cups
Rama used 30 cups of cheese