Question 1189042
Tank A contains 30 liters of solution that has 9 liters of alcohol. Tank B has 50 liters of solution that has 25 liters of alcohol. What volume should be taken from each tank and combined in order to make up 40 liters of solution containing 40% alcohol by volume?
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Tank A has 9/30 = 30% alcohol
Tank B has 25/50 = 50% alcohol
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40% is the average of 30 & 50, so it's equal amounts, 20 liters of each.
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If it were not the average, the general solution by Theo would be necessary.