Question
It takes Machine J and Machine B 50 minutes to print a total of 2300 copies of newsletters. Machine J can print 21 copies of newsletters in one minute. How many copies of newsletters can Machine K print per minute?
2 m

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It takes Machine J and Machine B 50 minutes to print a total of 2300 copies of newsletters. Machine J can print 21 copies of newsletters in one minute. How many copies of newsletters can Machine K print per minute?