Question
It takes Machine T and Machine B 15 minutes to print a total of 765 copies of flyers. Machine T can print 21 copies of flyers in one minute. How many copies of flyers can Machine U print per minute?
2 m

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It takes Machine T and Machine B 15 minutes to print a total of 765 copies of flyers. Machine T can print 21 copies of flyers in one minute. How many copies of flyers can Machine U print per minute?