SOLUTION: How much 58% antifreeze solution and 45% antifreeze solution should be combined to give 39 gallons of 54% antifreeze solution?

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Question 422585: How much 58% antifreeze solution and 45% antifreeze solution should be combined to give 39 gallons of 54% antifreeze solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
39x.54=21.06
p+q=39
.58p+.45q=21.06
58p+45q=2106
45p+45q=1755
13p=351
p=27
q=12
You need 27 gallons of 58% solution and 12 gallons of 45% solution..