SOLUTION: The nurse has 4.25 liters of a solution that is 73% alcohol. How many liters of pure alcohol must she add to bring the solution to 91% concentration?

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Question 944382: The nurse has 4.25 liters of a solution that is 73% alcohol. How many liters of pure alcohol must she add to bring the solution to 91% concentration?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
The nurse has 4.25 liters of a solution that is 73% alcohol. How many liters of pure alcohol must she add to bring the solution to 91% concentration?
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Equation::
alcohol + alcohol = alcohol
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0.73*4.25 + 1*x = 0.91(4.25+x)
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73*4.25 + 100x = 91*4.25 + 91x
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9x = 18*4.25
x = 2*4.25 = 8.5 liters (amt. of pure alcohol to add)
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Cheers,
Stan H.
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