Question
It takes Machine C and Machine B 20 minutes to print a total of 900 copies of newsletters. Machine C can print 18 copies of newsletters in one minute. How many copies of newsletters can Machine D print per minute?
2 m

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It takes Machine C and Machine B 20 minutes to print a total of 900 copies of newsletters. Machine C can print 18 copies of newsletters in one minute. How many copies of newsletters can Machine D print per minute?