Question

In Mrs Fishers first pd. class, 7 students did not complete their hw, this was 35% of their class, how many students are in her class?

Answer 1

Mrs Fishers has 20 students in her class.

Explanation:

This problem can be written in the proportion
`(35)/(100)` =
`(7)/(x)` because
`(35)/(100)` is 35%, which is equal to
`(7)/(x)` because that is also 35%.

`(35)/(100)` =
`(7)/(x)` --- write proportion

35x = 700 --- cross multiply (multiply x by 35 and 7 by 100)

x = 20 --- divide both sides by 35.