Question

The ratio of the number of the boy and gorl in class is 7:4 . If the number of boys is 18 more than the number of girls, what os the total number of student in class?​

Answer 1

Given :

• The ratio of the number of the boy and gorl in class is 7 : 4.
• The number of boys is 18 more than the number of girls.

To Find :

• Find the total number of student in class ?

Solution :

• Let the number of girls be x.
• And the number of boys = x + 18.

According to the question :

➣ 7 : 4 = (x + 18) : x

➣ 7/4 = (x + 18)/x

Cross multiplication :

➣ 7x = 4(x + 18)

➣ 7x = 4x + 72

➣ 7x - 4x = 72

➣ 3x = 72

➣ x = 72/3

➣ x = 24

Finding the total number of students :

• Total students = Boys + Girls

➣ Total students = x + 18 + x

➣ Total students = 2x + 18

➣ Total students = 2(24) + 18

➣ Total students = 48 + 18

➣ Total students = 66

Hence,

• The total number of students in the class 66.

Answer 2

Answer:

The number of boys and girls in a class are in the ratio 7 : 5. The number of boys is 8 more than the number of girls. What is the total class strength ...