SOLUTION: In mixing some fuel, a scientist combines 50% ethanol solution with a 90% ethanol solution to get 40 liters 80% ethanol solution. How much of the 50% solution did the scientist us

SOLUTION: In mixing some fuel, a scientist combines 50% ethanol solution with a 90% ethanol solution to get 40 liters 80% ethanol solution. How much of the 50% solution did the scientist us

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Question 417853: In mixing some fuel, a scientist combines 50% ethanol solution with a 90% ethanol solution to get 40 liters 80% ethanol solution. How much of the 50% solution did the scientist use in the mixture?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
40x.8=32
.5m+.9(40-m)=32
.5m+36-.9m=32
4=.4m
4/.4=m=10
The scientist needs 10 liters of the 50% solution..
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