SOLUTION: "How much water must be added to a bottle of 840 cm^3 of acid which contains 10% of pure acid to obtain a solution of 7% pure acid?"

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Question 761753: "How much water must be added to a bottle of 840 cm^3 of acid which contains 10% of pure acid to obtain a solution of 7% pure acid?"
Answer by Alan3354(69443) About Me  (Show Source):
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"How much water must be added to a bottle of 840 cm^3 of acid which contains 10% of pure acid to obtain a solution of 7% pure acid?"
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840*10 + x*0 = (840+x)*7