SOLUTION: How many gallons of a 70% antifreeze solution must be mixed with 80 gallons of 15% antifreeze to get a mixture that is 60% antifreeze? Use the six step method

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Question 1047711: How many gallons of a 70% antifreeze solution must be mixed with 80 gallons of 15% antifreeze to get a mixture that is 60% antifreeze? Use the six step method
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
What is the "six step method"?

y, a variable for how many gallons of the 70% antifreeze to add.

pureAntifreeze%2FmixtureQuantity=concentrationWanted

%2870y%2B15%2A80%29%2F%28y%2B80%29=60-------the key equation to solve

%287y%2B15%2A8%29%2F%28y%2B80%29=6

7y%2B15%2A8=6y%2B480

y=480-15%2A8

y=360