Question

In a class girl are 60% of the total number of student and the boy are 18 in number. How many student are there in the class? ​

Answer 1

Answer: 45

Step-by-step explanation:

18           40

----   =    ----

              100

Cross multipy and divide by 40 to get 45

Answer 2

Answer:

The total number of students in the class is 45

Step-by-step explanation:

Let the total number of students in the class be x

Percentage of girls = 60%

Percentage of boys = 40%

∴ number of boys = 40% of x = $(x \times \frac{40}{100} ) = \frac{2x}{5}$

∴ $\frac{2x}{5} = 18$=> $x = \frac{18 \times 5}{2} = 45$

Hence, the total number of students in the class is 45