 When considering the composition of a class, the proportion of girls and boys is an important factor. This article will discuss the proportion of girls in a class composed of X girls and Y boys.

## Composition of Class

In a class composed of X girls and Y boys, the total number of students is X + Y. The proportion of girls in the class is X/(X+Y). For example, if a class has 10 girls and 20 boys, the total number of students is 30, and the proportion of girls in the class is 10/30 or 1/3.

Similarly, if a class has 30 girls and 40 boys, the total number of students is 70, and the proportion of girls in the class is 30/70 or 1/2.

## Proportion of Girls

The proportion of girls in a class composed of X girls and Y boys is determined by the ratio of X to (X+Y). If the number of girls is greater than the number of boys, the proportion of girls is greater than 1/2. Conversely, if the number of boys is greater than the number of girls, the proportion of girls is less than 1/2.

In addition, the proportion of girls can be expressed as a percentage. To calculate the percentage of girls in a class, divide the number of girls (X) by the total number of students (X+Y) and multiply the result by 100. For example, if a class has 10 girls and 20 boys, the percentage of girls in the class is 10/30 x 100, or 33.3%.

In conclusion, the proportion of girls in a class composed of X girls and Y boys is determined by the ratio of X to (X+Y). This proportion can also be expressed as a percentage, which is calculated by dividing the number of girls by the total number of students and multiplying the result by 100.