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The number of engineers in each team is 8, and Mr. Wells employs 15 team leaders, so the total number of engineers is 8 * 15 = <<8*15=120>>120 engineers.
The number of project managers for every 50 engineers is 5, so the number of project managers for 120 engineers is 120 / 50 * 5 = <<120/50*5=12>>12 project managers.
Therefore, Mr. Wells employs 12 project managers, so the answer is B. 12 project managers.