SOLUTION: How many liters of pure alcohol must be added to 10 liters of a 30% solution to obtain an 80% solution?

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Question 819911: How many liters of pure alcohol must be added to 10 liters of a 30% solution to obtain an 80% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Simple two-part mixture problem that goes like this:

Let u = amount of pure alcohol to add.
%2810%2A30%2Bu%2A100%29%2F%2810%2Bu%29=80
Solve for u.