Question

If 70% of the students in a school are boys and the number of girls is 540,find the number of boys in the school?

Answer 1

Let the total number of Students be =X 
Number of Girls=540
Therefore, Number of Boys =X-540

If 70% of the students in a school are boys then 30% remaining will be girls.

30% X= 540

30 x/100=540

X=540x100/30

=1800

Total number of students=1800


Total number of boys=1800-540=1260 

∴Total number of boys=1260 

Answer 2

From the question asked we know that the number of student is be find here.
Let's suppose number of student is equal to "X"
and we know that number of girls  is =540 
So this way the number of boys will be equals to =X-540
We also know that 70 percents are boys and 30% are girls. so lets find the number of students first here.
That will be 30X/100 = 540
X= 540*100/30 so the total number of students will be 1800.
 by calculating the difference between total number and numbers of girl we can easily  calculate the number of boys.

Number of boys=1800 - 540 =1260 numbers of boys