The requirement of sugar for 5 cups of raspberry juice = 2 1/2 cups = 5/2 cups
The requirement sugar for 1 cup of raspberry juice = (5/2 + 5) cups
= (5/2 x 1/5) cups = 1/2 cups
Thus, the requirement of sugar for cups of the raspberry juice = 6 x 1/2 cups = 3 cups