Question
It takes Machine R and Machine B 20 minutes to print a total of 880 copies of newsletters. Machine R can print 18 copies of newsletters in one minute. How many copies of newsletters can Machine S print per minute?
2 m

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It takes Machine R and Machine B 20 minutes to print a total of 880 copies of newsletters. Machine R can print 18 copies of newsletters in one minute. How many copies of newsletters can Machine S print per minute?