SOLUTION: how many liters of 40% alcohol solution must be mixed with 20 liters of a 90% solution to get a 60% solution?

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Question 599613: how many liters of 40% alcohol solution must be mixed with 20 liters of a 90% solution to get a 60% solution?
Answer by unlockmath(1688) About Me  (Show Source):
You can put this solution on YOUR website!
Hello,
With this we can set up the following equation:
.4x+.9(20)=.6(x+20)
Expand out and solve for x and we get:
x=30 liters
Make sense?
RJ
www.math-unlock.com