SOLUTION: How many gal. of a 65% saline solution must be mixed with 8 gal. of pure water to make a 25% solution?

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Question 225941: How many gal. of a 65% saline solution
must be mixed with 8 gal. of pure water to
make a 25% solution?
Answer by nerdybill(5410) About Me  (Show Source):
You can put this solution on YOUR website!
How many gal. of a 65% saline solution must be mixed with 8 gal. of pure water to make a 25% solution?
.
Let x = gallons of 65% saline solution added
then
.65x = .25(8+x)
.65x = 2+.25x
.4x = 2
x = 2/.4
x = 5 gallons