SOLUTION: How many gallons of a 90% antifreeze solution must be mixed with 60% gallons of 15% antifreeze to get a mixture that is 80% antifreeze?

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Question 1087896: How many gallons of a 90% antifreeze solution must be mixed with 60% gallons of 15% antifreeze to get a mixture that is 80% antifreeze?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
Let n be the number of gallons of 90% antifreeze. Then:
.9n+.15(60)=.8(n+60)
.9n+9=.8n+48
.1n=39
n=390
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