SOLUTION: how many ounces of a 15% alcohol solution must be mixed with 3 ounces of a 20% solution to make a 18%alcohol solution

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Question 429317: how many ounces of a 15% alcohol solution must be mixed with 3 ounces of a 20% solution to make a 18%alcohol solution
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.15x+3(.2)=.18(3+x)
.15x+.6=.54+.18x
.06=.03x
.06/.03=x
2=x
You need 2 ozs of a 15% solution to make the desired mix..