SOLUTION: How many gallons of a 40% solution must be mixed with 80 gallons of a 22% solution to get a solution with 30%

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Question 403143: How many gallons of a 40% solution must be mixed with 80 gallons of a 22% solution to get a solution with 30%
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
x(40%) + 80(22%) = (80 + x)(30%)