4/7 of the students in a classroom are girls if there are nine boys in the class how many total students are there?

A. 14

B. 28

C. 21

D. 12

21 students were in the class.

Step-by-step explanation:

The information in the question tells you that 4/7 of the class is girls.

That means that the remainder of the class is 1 - 4/7 = 3/7 boys

Let the total in the class = x

(3/7) x = 9 Multiply by 7

(3/7) * 7*x = 9 * 7 Simplify the right and left

3x = 63 Divide by 3

3x/3 = 63/3

x = 21

There were 21 students in the class.