Question

if 55% of students in a school are gorls and the number of boys is 270 find the number of girls in the school

Answer 1

Let the number of students be x.

So,(100-55)% of x=number of boys.

=>45% of x=270

=>x=270*100/45

=>x=600

Number of girls=600-270=330

Answer 2

Given :

55% of students in a school are gorls and the number of boys is 270

To Find :

find the number of girls in the school

Solution:

Let the number of students be x

Girls percentage = 55%

Boys percentage = 100% -55% = 45%

No. of boys = 0.45x

We are given that  number of boys is 270

So, 0.45x = 270

$x=\frac{270}{0.45}$

x=600

No. of girls = $55\% \times 600 = \frac{55}{100} \times 600 = 330$

Hence The number of girls are 330 in school.