Question
It takes Machine X and Machine B 10 minutes to print a total of 500 copies of posters. Machine X can print 20 copies of posters in one minute. How many copies of posters can Machine Y print per minute?
2 m

Click button first when a symbol is required. X

It takes Machine X and Machine B 10 minutes to print a total of 500 copies of posters. Machine X can print 20 copies of posters in one minute. How many copies of posters can Machine Y print per minute?