SOLUTION: how much pure alcohol must be added to 4 liters of 10% alcohol solution to make a solution that is 20% alcohol?

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Question 823233: how much pure alcohol must be added to 4 liters of 10% alcohol solution to make a solution that is 20% alcohol?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
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10*4 + 100v = 20(v + 4)
40 + 100v = 20v + 80
80v = 40
v = 0.5
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answer:
add 0.5 liter of pure alcohol, and you'll have 4.5 liters of 20% alcohol
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