SOLUTION: How many gallons of pure anti-freeze should be mixed with 60 gallons of a 25% solution to obtain a 40% solution?

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Question 87038: How many gallons of pure anti-freeze should be mixed with 60 gallons of a 25% solution to obtain a 40% solution?
Answer by scianci(186) About Me  (Show Source):
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let x = the # of gallons of pure anti-freeze. Add this to whatever 25% of 60 is. Then express the # of gallons of solution in terms of x. Make these two quantites equal to each other and solve the resulting equation for x.