Question

The ratio of boys to girls in Coach Snyder's class is 2 to 3. There are 18 girls in the class. What is the total number of students in Coach Snyder's class?

Answer 1

Let B = boys, G = girls

So B:G=2:3

Number of girls = 18,

To get the total from a known quantity of the proportion, you can always divide the known quantity with its respective proportion of the total:

Total = (girls' number)/(girls' proportion)

Girls' number=18

Girls' proportion= 3/(2+3)

=3/5

Total:

`\begin{gathered} (18)/((3)/(5)) \\ =18((5)/(3)) \\ =6(5) \\ =30 \end{gathered}`

In summary, Coach Snyder's class has 30 students.