SOLUTION: How much pure water must be mixed with 4 pints of 90% developer to produce a mixture that is 19% developer?

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Question 141628: How much pure water must be mixed with 4 pints of 90% developer to produce a mixture that is 19% developer?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.90*4=.19(X+4)
3.6=.19X+.76
.19X=3.6-.76
.19X=2.84
X=2.84/.19
X=14.95 LITERS OF WATER WILOL BE NEEDED.
PROOF:
.9*4=.19(14.95+4)
3.6=.19*18.95
3.6=3.6