Question
It takes Machine L and Machine B 15 minutes to print a total of 840 copies of newsletters. Machine L can print 25 copies of newsletters in one minute. How many copies of newsletters can Machine M print per minute?
2 m

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It takes Machine L and Machine B 15 minutes to print a total of 840 copies of newsletters. Machine L can print 25 copies of newsletters in one minute. How many copies of newsletters can Machine M print per minute?