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OpenStudy (anonymous):
Marie mixes 16 liters of 18% acid solution with a 27% acid solution which results in 21% acid solution. Let x represent the number of liters of 27% solution used. Which equation can be used to find the number of liters of 27% acid solution in the mixture?
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OpenStudy (perl):
16 * .18 + x * .27 = .21 ( 16 + x)
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