Question

in a class 45 % of students are girls. if there are 18 girls in a class than find total number of students.​

Answer 1

Answer: 40

Step-by-step explanation:

Let the total number of students be x.

Number of girls=18

45% of students are girls.

Therefore, 45% of x=18

45/100 × x=18

45x= 18×100

45x=1800

x=1800/45

x=40

Hence, the total number of students is 40.

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Answer 2

The total number of students in the class is 40.

Given :

% of students of girls = 45%

No. Of girls in the class = 18

To find :

The total number of students in the class

Solution :

Let the total number of students in the class be x

It is said, 45%of x = 18

According to the problem,

(45/100) x x = 18

=> 45x/100 = 18

=> 9x/20 = 18

=> 9x = 20 x 18

=> 9x = 360

Therefore, x = 360/9

x= 40

Therefore, the total number of students in the class is 40.

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