Problema Solution
How many cup of juice must be added to 30 cup of punch that is 8% grapefruit juice, to obtain a punch that is 10% grapefruit?
Answer provided by our tutors
x + 0.08*30 = 0.10(x+30)
Multiply by 100 to get:
100x + 8*30 = 10x + 10*30
90x = 2*30
x = 2/3 of a cup of 100% grapejuice must be added.