SOLUTION: I need help setting up an equation for the following question: A 20L solution is 15% alcohol. How much water must be added to make it an 8% alcohol solution?

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Question 108704: I need help setting up an equation for the following question:
A 20L solution is 15% alcohol. How much water must be added to make it an 8% alcohol solution?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let x="added water" ... 20(15%)+x(0%)=(20+x)(8%)