The ratio of boys to girls is 3 to 1. In a school of 400 students, how many are girls? The answer must be a whole number

Answer 1

The ratio of boys to girls is 3 to 1, which means that for every 3 boys, there is 1 girl.

To find the number of girls in a school of 400 students, we can start by determining the ratio of boys to the total number of students. This ratio would be 3 boys to 4 students (3 boys + 1 girl = 4 students).

To find the number of girls, we can set up a proportion:

(1 girl) / (4 students) = (x girls) / (400 students)

Cross-multiplying, we get:

1 * 400 = 4 * x

400 = 4x

Dividing both sides by 4, we find:

x = 400 / 4

x = 100

Therefore, there are 100 girls in the school.