Answer:
There are 180 fifth graders.
Step-by-step explanation:
Since fourth graders occupy 13 of the tables, we can subtract 13 from 28, the total number of tables there are. This will find you the amount of tables remaining, where the fifth graders sit. 28 minus 13 is 15.
Therefore, there are 15 tables occupied by fifth graders. Each table has 12 students, so 15 tables times 12 people is 180.
There are 180 fifth graders in the cafeteria.