SOLUTION: What quantity of 73% chlorine solution must be mixed with a 30% chlorine solution to produce 399.12 mL of 69% solution?

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Question 1097835: What quantity of 73% chlorine solution must be mixed with a 30% chlorine solution to produce 399.12 mL of 69% solution?

Answer by Alan3354(69443) About Me  (Show Source):
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What quantity of 73% chlorine solution must be mixed with a 30% chlorine solution to produce 399.12 mL of 69% solution?
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s + t = 399.12 (total solution)
73s + 30t = 399.12*69