SOLUTION: Lisa will make punch that is 25% fruit juice by adding pure fruit juice to a 2 liter mixture that is 10% pure fruit juice. How many liters of pure fruit juice does she need to add?

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Question 306189: Lisa will make punch that is 25% fruit juice by adding pure fruit juice to a 2 liter mixture that is 10% pure fruit juice. How many liters of pure fruit juice does she need to add?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the number of liters of 100% fruit juice.
Write the concentration equation.
100A%2B10%282%29=25%28A%2B2%29
100A%2B20=25A%2B50
75A=30
A=30%2F75
A=2%2F5
2/5 of a liter (400 ml) of 100% fruit juice.