Question

in a school four by 9 of the students are boys and the number of girls is 775 find the number of boys in the school

Answer 1

Let the total number of students be a

According to question

Number of boys = 4a/ 9

Now,

Total number of students = 4a/9 + 775

=> a = 4a/9 +775

=> a - 4a/9 = 775

=> 5a/9 = 775

=> a = 775 × 9 / 5

=> a = 155 × 9

=> a = 1395

Number of boys = 4 × 1395 / 9

= 4 × 155

= 620

Answer 2

let the total no. of students in the school be x
no. of girls= 775
no. of boys=(4/9)x
so, (4/9)x +775=x
4x/9+775=x
775=x-(4x/9)
775=5x/9
775×9=5x
(775×9)/5=x
1395=x
no. of boys =(4×1395)/9
=620.