Final answer:
The number of seats in the campus restaurant and what students are doing at the tables cannot be confidently determined from the given scenario. Students appear to be concerned about seating availability and time management.
Step-by-step explanation:
Based on the information provided, it is not possible to accurately determine the exact number of seats available in the campus restaurant, as the scenario described does not specify this detail. It appears that the students are concerned about finding a table that will seat them as a group due to the busy time between classes. The students' activities at the tables are not explicitly stated, so it is unclear whether they are eating, studying, or doing both.
The observation that they are checking their watches suggests a concern for time management and the desire to eat within a limited timeframe. As for the responsibility of the seater mentioned in the prompt, it is a common practice in restaurants for a host or seater to inform guests when their table is ready.