Question

a class contains 13 girls and 15 boys.
what is the ratio of boys to girls? 15:13
how many students are there in all?
what fraction of the students are girls
13
15
28

Explanation:

Sub - question 1: How many students are there in all?

Step1: Identify the number of girls and boys

Number of girls = 13, Number of boys = 15

Step2: Calculate total number of students

To find the total number of students, we add the number of girls and boys. So, total students = number of girls + number of boys = $13 + 15$
$13+15 = 28$

Step1: Recall the number of girls and total students

Number of girls = 13, Total number of students = 28 (from the first sub - question)

Step2: Calculate the fraction of girls

The fraction of girls is given by the formula $\frac{\text{Number of girls}}{\text{Total number of students}}=\frac{13}{28}$

Answer:

28

Sub - question 2: What fraction of the students are girls?