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OpenStudy (anonymous):
a copy machine makes 28 copies per minute.how long does it take to make 161 copies
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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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