SOLUTION: How much pure alcohol must be added to a 4L of a 10% alcohol solution that is 20% alcohol? Please show work not just the answer.

Question 920233: How much pure alcohol must be added to a 4L of a 10% alcohol solution that is 20% alcohol? Please show work not just the answer.
Found 2 solutions by Alan3354, josmiceli:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Not clear.
4L of a 10% alcohol solution that is 20% alcohol
Is it 10% or 20%?
What do you want to do?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
L of alcohol in 10% solution
Let = L of pure alcohol to be added
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.5 L must be added to the 10% solution
check:

OK
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