SOLUTION: Beau Glaser wishes to strengthen a mixture from 10% alcohol to 30% alcohol. How much pure alcohol should be added to 7 L of 10% mixture?

Question 333609: Beau Glaser wishes to strengthen a mixture from 10% alcohol to 30% alcohol. How much pure alcohol should be added to 7 L of 10% mixture?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Beau Glaser wishes to strengthen a mixture from 10% alcohol to 30% alcohol. How much pure alcohol should be added to 7 L of 10% mixture?
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7 liters of 10% is 90% water = 6.3 liters of water
Adding alcohol to make it 30% alcohol means that 6.3 liters of water will be 70% of the mixture.
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If 6.3 liters = 70%, then 9 liters = 100%
Add 2 liters of alcohol (9 - 7 = 2 liters)

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