Math
posted by Eric .
A class has 27 students. Fifteen are boys and the rest are girls. What is the ratio of girls to total students?
12 : 15
15 : 12
27 : 12
12 : 27

Obviously there are 12 girls
so ratio of girls : total
= 12 : 27
= 4 : 9
The ratios should have been reduced in the answer choices.