SOLUTION: How many ounces of a 15% alcohol solution must be mixed with 4 ounces of a 20% alcohol solution to make a 17% alcohol solution?

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Question 350066: How many ounces of a 15% alcohol solution must be mixed with 4 ounces of a 20% alcohol solution to make a 17% alcohol solution?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.20*4+.15X=.17(X+4)
.8+.15X=.17X+.68
.15X-.17X=.68-.80
-.02X=-.12
X=-.12/-.02
X=6 OZ. OF 15% SOLUTION IS USED.
PROOF:
.20*4+.15*6=.17(6+4)
.8+.9=.17*10
1.7=1.7