Question

30 students in a class. 18 are girls. what is the ratio of boys to total number of students in the class?​

Answer 1

30-18 = 12
18 girls
12 boys

12/18
1.5

the ratio is 18/30
1.6

Answer 2

2:5

Explanation:

there are 12 boys in the class because 30 minus 18 is 12.

so you get a ratio of 12:30

and to simplify it you divide by a common factor which is 6

and you get 2:5