SOLUTION: Carol needs a 20% solution of alcohol. She has a 15% solution on han, as well as a 30% solution. How many liters of the 15% solution should she add to 3 liters of the 30% solution

SOLUTION: Carol needs a 20% solution of alcohol. She has a 15% solution on han, as well as a 30% solution. How many liters of the 15% solution should she add to 3 liters of the 30% solution

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Question 1066267: Carol needs a 20% solution of alcohol. She has a 15% solution on han, as well as a 30% solution. How many liters of the 15% solution should she add to 3 liters of the 30% solution to obtain her 20% solution.
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
Let n be the number of liters of the 15% solution. Then:
.15n+.3(3)=.2(n+3)
.15n+.9=.2n+.6
.05n=.3
n=6
Carol needs 6 liters of her 15% solution. ☺☺☺☺
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