Question
It takes Machine A and Machine B 10 minutes to print a total of 490 copies of catalogs. Machine A can print 20 copies of catalogs in one minute. How many copies of catalogs can Machine B print per minute?
2 m

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It takes Machine A and Machine B 10 minutes to print a total of 490 copies of catalogs. Machine A can print 20 copies of catalogs in one minute. How many copies of catalogs can Machine B print per minute?