Question: A chemist needs a 20% solution of alcohol. She has a 15% solution on hand as well a 30% solution. How many liters of the

A chemist needs a 20% solution of alcohol. She has a 15% solution on hand as well a 30% solution. How many liters of the 15% solution should she add to 3L of the 30% solution to obtain the 20% solution. Show full algebraic work.

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