SOLUTION: How many gallons of a 30% salt solution must be added to 5 gallons of a 10% salt solution to yield a solution that is 17.5% salt?

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Question 269787: How many gallons of a 30% salt solution must be added to 5 gallons of a 10% salt solution to yield a solution that is 17.5% salt?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.30X+.10*5=.175(X+5)
.30X+.5=.175X+.875
.30X-.175X=.875-.5
.125X=.375
X=.375/.125
X=3 GALLONS OF 30% SALT IS USED.
PROOF:
.30*3+.10*5=.175(3+5)
.9+.5=.175*8
1.4=1.4