Question

in a school 3/7 of the students are girls. if there are 240 boys, find the number of girls in the school

Answer 1

Hi.

Here is your answer---

Let the number of Students in a school be x.

Thus,Number of Girls = 3/7 of the total Students
                                   = 3/7 of x
                                   = 3x/7

We know,

         Number of Boys + Number of Girls = Total Students.
            240 + 3x/7 = x
             240 = x - 3x/7
              240 = (7x - 3x) /7                       [Taking L.C.M.]
          240 × 7 = 4x
            x = 60 × 7
            x = 420

Total number of Students in a school is 420.

Thus, Number of Girls = 3/7 × x
                                    = 3/7 × 420
                                    = 90 

Thus, the number of Girls in a school is 90.

______________________

Hope it helps.

Have a nice day.

Answer 2

according to my view my answer girls = 180
total students are 420