SOLUTION: in what proportion should you mix a 12%,17% and 9% solution to get an 11% solution?

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Question 927929: in what proportion should you mix a 12%,17% and 9% solution to get an 11% solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
You can use the 12% and 9%, or the 17% and 9% or some combination of the 12 and 17 with the 9%
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"should" is not a well defined math term.