There are 15 girls and 12 boys in a class. What is the ratio of girls to boys? Give your answer in its simplest form.
The ratio of girls to boys is 15:12
However, both sides of this ratio are divisible by 3
Dividing by 3 gives 5:4
5 and 4 have no common factors (apart from 1).
So the simplest form of the ratio is 5:4
This means there are 5 girls in the class for every 4 boys.
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