Question
It takes Machine E and Machine B 30 minutes to print a total of 1920 copies of newsletters. Machine E can print 28 copies of newsletters in one minute. How many copies of newsletters can Machine F print per minute?
2 m

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It takes Machine E and Machine B 30 minutes to print a total of 1920 copies of newsletters. Machine E can print 28 copies of newsletters in one minute. How many copies of newsletters can Machine F print per minute?