SOLUTION: how many liters of a 15% solution of alcohol should be added to a 30 liters of a 50% solution to produce a 40% solution

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Question 644804: how many liters of a 15% solution of alcohol should be added to a 30 liters of a 50% solution to produce a 40% solution
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.15x+.3*50=.4*(30+x)