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There are many benefits to timing your practice, including:
1. What is the maximum number of pencils that could be produced by machine A? Machine A should operate the maximum time, 8 hours: 9000*8 = 72'000 pencils
2. What do we have for machine B? 100'000 - 72'000 = 28'000 pencils. It is the minimum number of pencils that could be produced by machine B and it will take 28'000 / 7'000 = 4 hours. _________________