Question

There are 25 girls in a class. If the ratio of boys and girls in that class is 4:5, what is the total numer of students in that class?

• A. 45

Answer 1

The correct option is A 45
Let the number of boys is $4x$ and the number of girls is $5x$.

According to the question, $5x=25$

$\Rightarrow 5x=25\Rightarrow x=\frac{25}{5}\Rightarrow x=5$

Hence, the number of boys are, $4x=4\times 5=20$

Therefore, total number of students in class is $20+25=45$