Question

The ratio of the girls to the total number of students in class is 47 how many students are girls in the class has 21 students and all

Answer 1

You can cross multiply to get 4 * 21 = 7x

84 = 7x; divide both sides by 7

12 = x so the number 12 will go in the blank (12 girls)

Answer 2

The answer is 12 since 21/7 is 3 so you multiply 4 by 3