Question
It takes Machine X and Machine B 15 minutes to print a total of 900 copies of posters. Machine X can print 28 copies of posters in one minute. How many copies of posters can Machine Y print per minute?
2 m

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It takes Machine X and Machine B 15 minutes to print a total of 900 copies of posters. Machine X can print 28 copies of posters in one minute. How many copies of posters can Machine Y print per minute?