Question
It takes Machine M and Machine B 40 minutes to print a total of 2560 copies of newsletters. Machine M can print 28 copies of newsletters in one minute. How many copies of newsletters can Machine N print per minute?
2 m

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It takes Machine M and Machine B 40 minutes to print a total of 2560 copies of newsletters. Machine M can print 28 copies of newsletters in one minute. How many copies of newsletters can Machine N print per minute?