SOLUTION: Prepare 240 g of 3.5% sulfate ointment using a 2% ointment and a 4% ointment.

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Question 636366: Prepare 240 g of 3.5% sulfate ointment using a 2% ointment and a 4% ointment.
Answer by Alan3354(69443) About Me  (Show Source):
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Prepare 240 g of 3.5% sulfate ointment using a 2% ointment and a 4% ointment.
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t = 2%
f = 4%
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t + f = 240
2t + 4f = 3.5*240