SOLUTION: How many gallons of 40 percent alcohol solution must be mixed with 70 percent solution to obtain 30 gallons of a 52 percent alcohol solution?

Question 463955: How many gallons of 40 percent alcohol solution must be mixed with 70 percent solution to obtain 30 gallons of a 52 percent alcohol solution?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
How many gallons of 40 percent alcohol solution must be mixed with 70 percent solution to obtain 30 gallons of a 52 percent alcohol solution?
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All these solution problems go like this:
f = 40%, s = 70%
f + s = 30 (total solution)
0.4f + 0.7s = 0.52*30 (total alcohol)
Can you finish it?

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