SOLUTION: how many grams of water must be added to 50 grams of a 30% acid solution in order to produce a 20% acid solution?

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Question 586703: how many grams of water must be added to 50 grams of a 30% acid solution in order to produce a 20% acid solution?
Answer by ad_alta(240) About Me  (Show Source):
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Let 'w' be the grams of water needed. Then we must have (0.30*50)/(50+w)=0.20. We get w=25 grams.