SOLUTION: How much pure water must be mixed with 5 pints of 50% developer to produce a mixture that is 35% developer?

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Question 104202: How much pure water must be mixed with 5 pints of 50% developer to produce a mixture that is 35% developer?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let x=(pints of water) ... water is 0% developer

5(50%)+x(0%)=(5+x)(35%)