SOLUTION: Two solutions of salt water contain 0.09% and 0.29% salt respectively. A lab technician wants to make 1 liter of solution which contains 0.12% salt. How much of each solution shoul

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Question 1058710: Two solutions of salt water contain 0.09% and 0.29% salt respectively. A lab technician wants to make 1 liter of solution which contains 0.12% salt. How much of each solution should she use?
Answer by stanbon(75887) About Me  (Show Source):
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Two solutions of salt water contain 0.09% and 0.29% salt respectively. A lab technician wants to make 1 liter of solution which contains 0.12% salt. How much of each solution should she use?
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Equation:
salt + salt = salt
0.09x + 0.29(1-x) = 0.12*1
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9x + 29 - 29x = 12
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-20x = -17
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x = 0.85 liters (amt. of 9% solution needed)
1-0.85 = 0.15 liters (amt. of 29% solution needed)
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Cheers,
Stan H.
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