Final answer:
In the school lunchroom at Sea World Kansas City, the maximum number of students that can be seated at lunch at one time is 16.
Step-by-step explanation:
To determine the number of students that can be seated at lunch at one time, we need to compare the number of seats available in the school lunchroom to the number of students to be seated. In this case, there are 16 seats available and 22 students. Since there are fewer seats than students, not all students will be able to be seated at once. Therefore, the maximum number of students that can be seated at lunch at one time is 16.