SOLUTION: How do you solve: Jeff wants to make 30 gallons of a 42% alcohol solution by mixing a 30% alcohol solution with a 70% alcohol solution. How many gallons of each solution does he

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Question 281534: How do you solve:
Jeff wants to make 30 gallons of a 42% alcohol solution by mixing a 30% alcohol solution with a 70% alcohol solution. How many gallons of each solution does he need?
Thank you!

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
just like all mixture problems.
30*.42=.3x+.7y
x+y=30
x=21
y=9