Answer:
(5/6) cup carbonated water
Explanation:
We can easily solve this problem by applying a rule of three.
4 cups of orange juice ------------------------ 2/3 cup carbonated water
5 cups of orange juice ------------------------ x
x = (5/4)*2/3 cup carbonated water
x = (10/12) cup carbonated water
x = (5/6) cup carbonated water
x = 0.8333 cup carbonated water