Question

in a class 60% of the students are girls they are 18 girls in the class how many students are in the class how many boys are in the class

Answer 1

Let the number of students in the class be n

Then

60% of n = 18

$\begin{gathered} \Rightarrow\frac{60n}{100}=\frac{18}{1} \\ \text{cross multiplying, we have} \\ 60n=100\times18 \\ \Rightarrow n=\frac{100\times18}{60}=30 \end{gathered}$

Therefore there are 30 students in the class

Since there are 18 girls, then there must be (30-18) boys in the class

That is there are 12 boys in the class