SOLUTION: To reduce 56 grams of a 70% antiseptic solution to a 20% solution, how much distilled water should a pharmacist add?

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Question 939203: To reduce 56 grams of a 70% antiseptic solution to a 20% solution, how much distilled water should a pharmacist add?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
x the amount of distilled water to add
x + .30(56g) = .80(56g + x)
x = .50(56g)/.20 = 140g, the amount of distilled water to add