SOLUTION: (a) A nurse has two solutions that contain different concentrations of a certain medication. One is a 12.5% concentration and the other is a 5% concentration. How many cubic

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Question 903928: (a) A nurse has two solutions that contain different concentrations of a certain medication. One is a 12.5% concentration and the other is a 5% concentration. How many cubic centimeters of each should she mix to obtain 20 cubic centimeters of an 8% concentration?

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
(a) A nurse has two solutions that contain different concentrations of a certain medication. One is a 12.5% concentration and the other is a 5% concentration. How many cubic centimeters of each should she mix to obtain 20 cubic centimeters of an 8% concentration?

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Equation::
active + active = active
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0.125x + 0.05(20-x) = 0.08*20
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125x + 50(20-x) = 80*20
125x + 50*20 - 50x = 80*20
75x = 30*20
x = 8 cc (amt. of 12.5% solution needed)
20-x = 12 cc (amt. of 8% solution needed)
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Cheers,
Stan H.
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