SOLUTION: How much developer must be added to 9 pints of 15% developer to produce a mixture that is 50% developer?

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Question 343678: How much developer must be added to 9 pints of 15% developer to produce a mixture that is 50% developer?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(9)(15%) + (x)(100%) = (9 + x)(50%)