SOLUTION: An alcohol solution was made by mixing 12 fl. oz of a 30% alcohol solution and 3 fl.oz of a 90% solution. What is the concentration of the mixture?

Question 821636: An alcohol solution was made by mixing 12 fl. oz of a 30% alcohol solution and 3 fl.oz of a 90% solution. What is the concentration of the mixture?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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30(12) + 90(3) = x(15)
360 + 270 = x(15)
630 = x(15)
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answer:
x = 42% alcohol in the final mixture
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