Question
It takes Machine X and Machine B 20 minutes to print a total of 1340 copies of catalogs. Machine X can print 31 copies of catalogs in one minute. How many copies of catalogs can Machine Y print per minute?
2 m

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It takes Machine X and Machine B 20 minutes to print a total of 1340 copies of catalogs. Machine X can print 31 copies of catalogs in one minute. How many copies of catalogs can Machine Y print per minute?