SOLUTION: How much water should be added to four liters of pure alcohol to make a mixture of 40% alcohol?

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Question 766455: How much water should be added to four liters of pure alcohol to make a mixture of 40% alcohol?
Answer by lwsshak3(11628) About Me  (Show Source):
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How much water should be added to four liters of pure alcohol to make a mixture of 40% alcohol?
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let x=amount of water to add
100%*4+0%x=40%(4+x)
4=1.6+.4x
.4x=2.4
x=6
amount of water to add=6 liters