SOLUTION: how many gallons of 50% antifreeze solution must be mixed with 80 gallons of 15% anifreeze to get a mixture that is 40% anitfreeze?

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Question 499482: how many gallons of 50% antifreeze solution must be mixed with 80 gallons of 15% anifreeze to get a mixture that is 40% anitfreeze?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
how many gallons of 50% antifreeze solution must be mixed with 80 gallons of 15% anifreeze to get a mixture that is 40% anitfreeze?
.
Let x = amount (gallons) of 50% antifreeze
then
.50x + .15(80) = .40(x + 80)
.50x + 12 = .40x + 32
.10x + 12 = 32
.10x = 20
x = 200 gallons