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 the 10% mixture?
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Question 258476: Beau Glaser wishes to strengthen a mixture from 10% alcohol to 30% alcohol. How much pure alcohol should be added to 7 L of the 10% mixture? Answer by checkley77(12844) (Show Source):
You can put this solution on YOUR website! .10*7+x=.30(7+x)
.7+x=2.1+.3x
x-.3x=2.1-.7
.7x=1.4
x=1.4/.7
x=2 liters of pure alcohol is needed.
Proof:
.10*7+2=.30(7+2)
.7+2=.3*9
2.7=2.7
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