There are 4 boys in a class of 13 students. (a) What is the ratio of girls to boys? (b) What is the ratio of all students in the class to girls?

Question

need help answering this question 

Answer 1

13 - 4 = 9 girls

girls = 9

boys    4

 

all students = 13

     girls           9

Answer 2

Figure out how many girls there are.

Now you know both numbers needed to form the ratio of girls to boys.

And you can also compute the second ratio requested.  

Just do your thinking first, and remember that the ratio of two quantities x and y (for example) IS WRITTEN AS x/y.