SOLUTION: How many liters of a 20% alcohol solution must be mixed with 20 liters of a 70% solution to get a 60% solution?

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Question 664932: How many liters of a 20% alcohol solution must be mixed with 20 liters of a 70% solution to get a 60% solution?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
let x be the number of liters of 20% solution to be added. Then
0.2x+%2B+0.7%2820%29+=+0.6%2820+%2B+x%29
.2x+%2B+14+=+12+%2B+0.6x
2+=+.4x
5+=+x
you need to add 5 liters