It is Sam Border if you didn't know. To know what a main character is it is the character who is talked about throughout the whole book and/or is on the cover on the book. It is a strategy to know the main character(s) of the book. I hope this helps.
The question could actually mean something completely different to the way I’ve interpreted it and i might be wrong but anyway...
Answer: 18
Explanation: From what you’ve said , each operating theatre needs 2 doctors and 4 nurses so that’s 6 medical staff per theatre. If there’s 3 of them, multiply 6 by 3 to get the total staff: 18
