A job-shop manufacturing system makes two parts requiring two types of machines. The two parts (X&Y) are identified below. Also shown are the time standards in units per hour for each machine (A & B). Demand: 19,049 units of each part Shift: 4 hours Utilization: 45 minutes/hour Units per hour: Machine A, Part X: 5,199 Machine A, Part Y: 1,285 Machine B, Part X: 3,770 Machine B, Part Y: 5,846 How many Machine B are needed to be able to meet demand for Part X if Part Y is not considered