SOLUTION: how many liters of a 10% acid solution must be mixed with a 50% acid solution in order to obtain 20 liters of a 30% solution

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Question 657669: how many liters of a 10% acid solution must be mixed with a 50% acid solution in order to obtain 20 liters of a 30% solution
Answer by Alan3354(69443) About Me  (Show Source):
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how many liters of a 10% acid solution must be mixed with a 50% acid solution in order to obtain 20 liters of a 30% solution
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Since 30 is the average of 10 & 50, it's equal amounts.