The school is planning a field trip. The school has 12 classrooms. There are 5 school buses and a total of 20 students in the school. If all buses are full How many seats are in each bus?
There are 12 classrooms in the school. 
There are 5 school buses. 
There are 20 students in the school. 

We want to know how many seats are in each bus. 

There are 5 buses, so we can divide 20 students by 5 buses. 

Each bus would have 4 students.