SOLUTION: how many liters of a 40% acid solution must be added to 100 liters of a 25% solution to obtain a 30% solution?

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Question 888929: how many liters of a 40% acid solution must be added to 100 liters of a 25% solution to obtain a 30% solution?
Answer by Alan3354(69443) About Me  (Show Source):
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how many liters of a 40% acid solution must be added to 100 liters of a 25% solution to obtain a 30% solution?
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100*25 + Liters*40 = (100 + Liters)*30