Math CentralQuandaries & Queries


Question from Jessica, a student:

How many gallons of distilled water must be mixed with 50 gallons of 30% alcohol solution to obtain a 25% solution?

Hi Jessica,

You have 50 gallons of a 30% alcohol solution so you have 30/100 times 50 = 15 gallons of alcohol. How many gallons of distilled water would you need to add to this 15 gallons of alcohol to obtain a 25% alcohol solution?


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