Question
It takes Machine R and Machine B 10 minutes to print a total of 660 copies of business cards. Machine R can print 31 copies of business cards in one minute. How many copies of business cards can Machine S print per minute?
2 m

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It takes Machine R and Machine B 10 minutes to print a total of 660 copies of business cards. Machine R can print 31 copies of business cards in one minute. How many copies of business cards can Machine S print per minute?