SOLUTION: How much antifreeze should be added to 300 gallons of a 30% antifreeze solution to raise the concentration to 40%

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Question 627826: How much antifreeze should be added to 300 gallons of a 30% antifreeze solution to raise the concentration to 40%
Answer by reviewermath(1029) About Me  (Show Source):
You can put this solution on YOUR website!
%28x+%2B+0.3%28300%29%29%2F%28x+%2B+300%29+=+0.4
x+%2B+90+=+0.4x+%2B+120
0.6x++=+30
x+=+50
Answer: 50 gallons of antifreeze