SOLUTION: How much pure water must be mixed with 2 pints of 50% developer to produce a mixture that is 12 developer?

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Question 296876: How much pure water must be mixed with 2 pints of 50% developer to produce a mixture that is 12 developer?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.5*2=.12(2+w)
w=6 1/3