A group of 280 elementary school students and 40 adults are going on a field trip. They are planning to use two different types of buses to get to the destination. The first type of bus holds 50 people and the second type of bus holds 20 people.

a. Write an equation to represent the combination of type 1 buses, w, and type 2
buses, t, that will accomodate all people on the field trip.

b. Solve the equation for w.

C. Solve the equation for t.
d. Which equation would you use to find the number of type 2 buses if they are
using 4 type 2 busses?