# 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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Multiply both sides by 100 to cancel out the % sign

2(10) + x(100) = (2+x)(25)

20 + 100x = 50 + 25x

Combine liek terms

75x = 30

x = 2/5 liters

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