Final answer:
A person with an MN special engineer license can be in charge of high and low pressure boilers, as long as the total power does not exceed 50 bhp.
Step-by-step explanation:
A person holding a current MN special engineer license could be in charge of high and low pressure boilers not to exceed a total of 50 bhp. This means that the person can oversee the operation and maintenance of boilers that operate at both high and low pressures, as long as the total combined power of the boilers does not exceed 50 bhp (boiler horsepower).