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Jotham needs 12 liters of a 60% alcohol solution. He has a 50% and a 90% solution available. How many liters of the 50% and

Jotham needs 12 liters of a 60% alcohol solution. He has a 50% and a 90% solution available. How many liters of the 50% and how many liters of the 90% solutions should he mix to make the 60% solution?

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