Question

the ratio of the number of boys and girls in a class in 5:9.Find the number of girls if the total number of students in the class in 56

Answer 1

let the boy are 5x and girls 9x
5x+9x=56
14x=56
x=4
then put the value of x
boys =5x=5×4=20
and girls =9x=9×5=45

Answer 2

Given,

The ratio of the number of boys to that of girls = 5:9,

The total number of students in class = 56.

To find,

The number of girls.

Solution,

The ratio of the number of boys to the number of girls is given as 5:9.

Firstly, let the number of boys be 5x, and,

let the number of girls be 9x.

Now, the total number of students is 56. So,

5x + 9x = 56

⇒ 14x = 56

⇒ x = 4.

From the above value of x, the number of boys and girls can be determined as follows.

The number of boys = 5x = 5(4) = 20,

the number of girls = 9x = 9(4) = 36.

Therefore, the number of girls in the class is 36.