Given:
A school is planning a 4th grade field trip. There are 157 students and 9 teachers in the 4th grade. Each bus holds 45 people.
Required:
To find the number of buses does the school need to make the field trip.
Final Answer:
There area total

166 people.
Let the number of bus be x.
Each bus holds 45 people, therefore

Final Answer:
4 buses need to make the field trip.