SOLUTION: How many gallons of a 65% solution must be mixed with 8 gallons of water to make a 25% solution?

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Question 212548: How many gallons of a 65% solution must be mixed with 8 gallons of water to make a 25% solution?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.65x=.25*(x+8)
.65x=.25x+2
.65x-.25x=2
.4x=2
x=2/.4
x=5 gallons of the 65% solution is needed.
Proof
.65*5=.25(8+5)
3.25=.25*13
3.25=3.25