SOLUTION: How many gallons of a 12% salt solution must be mixed with 6 gallons of a 20% salt solution to obtain a 15% salt solution?

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Question 211022: How many gallons of a 12% salt solution must be mixed with 6 gallons of a 20% salt solution to obtain a 15% salt solution?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.12x+.20*6=.15(x+6)
.12x+1.2=.15x+.9
.12x-.15x=.9-1.2
-.03x=-.3
x=-.3/-.03
x=10 gallons of 12% salt is used.
Proof:
.12*10+.20*6=.15(10+6)
1.2+1.2=.15*16
2.4=2.4