SOLUTION: How many cups of grape juice must be added to 40 cups of punch that is 5% grape juice to obtain a punch that is 10% grape juice?

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Question 312644: How many cups of grape juice must be added to 40 cups of punch that is 5% grape juice to obtain a punch that is 10% grape juice?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
40(5%) + x(100%) = (40+x)(10%)

dividing by 5% ___ 40 + 20x = 80+2x

18x = 40