Question

A certain school has 120 teachers. If this constitutes 30% of its whole school district, find the number of teachers in the whole school district

Answer 1

If 120 teachers is 30%, set an equal proportion to find the total amount.

`(120)/(x)` =
`(30)/(100)`; cross multiply to get 120*100 = 30x; multiply

12000 = 30x; divide both sides by 30

400 = x or 400 teachers total