Question

On a school field trip, the school requires that there are 6 teachers for every 90 students. If 135 students attend the trip how many teachers are needed? Write and solve a proportion showing your work. (3 points)

Answer 1

the answer is 9 teachers

Explanation:

step one is 135-90=?

step two is if 1 teachers for 15 students

2 techers are for 30 students until you get to 135

Answer 2

9 teachers.

Explanation:

We can visualize the information given as follows:

Students teachers

90 ⇒ 6

135 ⇒ x

Which tells us that for 90 students 6 teachers are needed, and for 135 students we have the unknown quantity of teachers x.

To find x we multiply the two cross quantities, and divide by the remaining amount

x = (135)(6) ÷ 90

x = 810 ÷ 90

x = 9

9 teachers are needed for 135 students.