Question

The ratio of boys to girls in a class is 3:1. There are 36 students in the class. How many students are girls?

What is the formula?
easy way​

Answer 1

9 girls in class

Explanation:

I start by multiplying by 10 to get an even number.

So 3 x 10 = 30

And 1 x 10 = 10

30 + 10 = 40 which is over 36.

Now we multiply by 9 because we need a lower number.

3 x 9 = 27

1 x 9 = 9

27 + 9 = 36

Therfore, your answer is 9 girls in class