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Mathematics 21 Online
OpenStudy (anonymous):

a copy machine makes 28 copies per minute.how long does it take to make 161 copies

OpenStudy (jdoe0001):

\(\begin{array}{llll} copies&minutes\\ 28&1\\ 161&x \end{array}\implies \bf \cfrac{28}{161}=\cfrac{1}{x}\)

OpenStudy (anonymous):

5 hrs an 45 mins

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