SOLUTION: A chemist needs to strengthen a 30% solution with a 75% solution to obtain a 40% solution. how much of the 75% solution should be added to 280 milliliters of the 30% solution?

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Question 469335: A chemist needs to strengthen a 30% solution with a 75% solution to obtain a 40% solution. how much of the 75% solution should be added to 280 milliliters of the 30% solution?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(280)(.30) + (x)(.75) = (280 + x)(.40)