Question

In Mr. Martinez's class, 40% of students turned their homework in on time. If

12 students turn their homework in on time, how many students are in Mr.
Martinez's class?

Answer 1

30 students

Explanation:

40% = 0.4 in decimal form

100% = 1

we are trying to find 100%

`(12)/(0.4)` =
`(x)/(1)`.............................set up proportion

12(1) = x(0.4).................cross multiply

12 = 0.4x.......................simplify

12/0.4 = x.....................divide both sides by 0.4

30 = x

Answer 2

30 kids bc 40%=12 so 20%=6 and 20%*5= 100% and 6*5=30