Question. A part requires operations A and B on a milling machine. It was calculated that in order to produce sufficient number of these parts to satisfy the demand, the production quantity of 5000 parts per week should be scheduled. The milling machine requires tool changes and preventive maintenance after every lot of 500 parts. These changes require 30 minutes. Find the number of machines required assuming that the company will be operating 5 days per week, 18 hours per day. The following information is known: Operation Standard time Efficiency Reliability A 5 min 95% 85% B 10 min 95% 90%