SOLUTION: How much pure water must be mixed with 7 pints of 50% developer to produce a mixture that is 23% developer?

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Question 141627: How much pure water must be mixed with 7 pints of 50% developer to produce a mixture that is 23% developer?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.5*7=.23(x+7)
3.5=.23x+1.61
.23x=3.5-1.61
.23x=1.89
x=1.89/.23
x=8.22 pints of water will be needed.
proof:
3.5=.23(8.22+7)
3.5=.23*15.22
3.5=3.5