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A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100 mL of a 12%-saline solution. How much of the 10%-saline solution did the pharmacist use in the mixture?

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10% saline 15%saline

12%
(15-12)=3 (12-10)=2
ratio of 10% saline:15% saline=3:2
total mixture volume=100ml
volume of 10% saline solution in 100ml mixture=(3/5)*100=60 ml
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