SOLUTION: suppose that you have a supply of a 30% alcohol solution and 70% alcohol solution . how many litters of each solution should be mixed to produce 20 liters that is 40% alcohol ?

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Question 893628: suppose that you have a supply of a 30% alcohol solution and 70% alcohol solution . how many litters of each solution should be mixed to produce 20 liters that is 40% alcohol ?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a+b=20,
.3a+.7b=.4*20
a=15, b=5