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.

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Well, there are 27 students in total. If 15 are boys, then the rest, which is 27 - 15 = 12, must be girls. So, the ratio of girls to total students is 12 : 27. It's like having 12 cupcakes out of 27 cupcakes. Who wouldn't want that many cupcakes?

To find the ratio of girls to total students, we need to know how many girls there are.

Since the class has 27 students and 15 are boys, we can calculate the number of girls by subtracting the number of boys from the total number of students:

Number of girls = Total number of students - Number of boys
Number of girls = 27 - 15
Number of girls = 12

So, the ratio of girls to total students is 12 : 27.

To find the ratio of girls to total students, we first need to determine the number of girls in the class.

Given that the class has 27 students and 15 of them are boys, we can find the number of girls by subtracting the number of boys from the total number of students.

Number of girls = Total number of students - Number of boys
Number of girls = 27 - 15
Number of girls = 12

Now that we know there are 12 girls, we can express the ratio of girls to total students as:

Number of girls : Total number of students
12 : 27

Therefore, the correct ratio of girls to total students is 12 : 27.