Question

The ratio of the no. of boys to that no.

*The girls is 7.3 If the number of boys in the school is 420 find

1)the number of girls in the school

2)Total no. of Students in the school​

Answer 1

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.

Step-by-step explanation:

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