SOLUTION: how much pure water must be mixed with 4 pints of 80% developer to produce a mixture that is 23% developer?

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Question 433222: how much pure water must be mixed with 4 pints of 80% developer to produce a mixture that is 23% developer?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how much pure water must be mixed with 4 pints of 80% developer to produce a mixture that is 23% developer?
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Equation:
water + water = water
0.20*4 + 1.00x = 0.77*(4+x)
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Multiply thru by 100 to get:
20*4 + 100x = 77*4+77*x
23x = 57*4
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x = (57*4)/23
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x = 9.91.. pints of water are needed
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cheers,
Stan H.