SOLUTION: how many gallons of 50% antifreeze solution must be mixed with 90 gallons of 30% antifreeze to get a muxture that is 40% antifreeze?

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Question 276605: how many gallons of 50% antifreeze solution must be mixed with 90 gallons of 30% antifreeze to get a muxture that is 40% antifreeze?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(50%)(x) + (30%)(90) = (40%)(x + 90) ___ percent to decimal

.5x + 27 = .4x + 36