Question

A school has 1800 st
students on its roll, 40 % of whom are girls. how many boy are there in the school​

Answer 1

1080 boys are in the school

Step-by-step explanation:

school has 1800 students.

40% are girls then boys are (100-40)=60%.

boys=1800×60÷100

=1080 boys.

Answer 2

Number of boys in the school =1080.

Step-by-step explanation:

Given,

Number of st students in the student on its roll = 1800

Percentage of girls = 40%

We have to find number of boys

Number of girls = 40% of Number of st students

                           = $\frac{40}{100}\times 1800$

                           = 720

Number of st students = Number of girls + Number of boys

1800 = 720 + Number of boys

Number of boys = 1800-720

                           = 1080

Hence,Number of boys in the school is 1080.