SOLUTION: How much pure water must be mixed with 8 pints of 70% developer to produce a mixture that is 36% developer?

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Question 352172: How much pure water must be mixed with 8 pints of 70% developer to produce a mixture that is 36% developer?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Pure water is 0% developer.
Let A be the amount of pure water used.
0%28A%29%2B70%288%29=36%28A%2B8%29
560=36A%2B288
36A=272
highlight%28A=68%2F9%29 pints