SOLUTION: How many liters of pure alcohol must be added to 20 liters of a 30% solution to obtain an 80% solution?

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Question 819270: How many liters of pure alcohol must be added to 20 liters of a 30% solution to obtain an 80% solution?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
30(20) + 100v = 80(20 + v)
600 + 100v = 1600 + 80v
20v = 1000
v = 50
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answer:
add 50 liters of pure alcohol
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