Final answer:
To find the number of projects in the auditorium, subtract the number of projects displayed in the library from the total number of projects.
Step-by-step explanation:
To find out how many projects were in the auditorium, we need to subtract the number of projects displayed in the library from the total number of projects. Given that Mr. X-Man displayed 16 projects in the library and there were 36 projects in total, we can subtract 16 from 36 to find the number of projects in the auditorium:
Projects in the auditorium = Total projects - Projects in the library
Projects in the auditorium = 36 - 16
Projects in the auditorium = 20