The school is planning a field trip. The school has 16 classrooms. There are 48 students in the school with each classroom having the same number of students. There are 21 seats on each school bus. How many students are in each class?
There are 16 classrooms in the school. 
There are 21 seats on each bus. 
There are 48 students in the school. 

There are not enough buses for each student to have their own seat, so some students will have to share a seat. 

We can divide the number of students by the number of seats on the bus to see how many buses we need: 

48 students ÷ 21 seats per bus = 2.286 buses

We need at least 3 buses. 

We can divide the number of students by the number of buses to see how many students will be on each bus: 

48 students ÷ 3 buses = 16 students per bus

We can divide the number of students by the number of classrooms to see how many students are in each class: 

48 students ÷ 16 classrooms = 3 students per class