x = teachers are needed.
Proportion:
6 / 90 = x / 135
3 ∙ 2 / 3 ∙ 30 = x / 135
2 / 30 = x / 135
Cross Multiply
2 ∙ 135 = 30 ∙ x
270 = 30 x
Divide both sides by 30
270 / 30 = 30 x / 30
9 = x
x = 9
OR
( 6 / 90 ) ∙ 135 = 6 ∙ 135 / 90 = 810 / 90 = 9
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?
Plz help
2 answers
Thanks sm!