Question

70% of the student in a school are boys and the number of girl is 504 find the number of boys in the school

Answer 1

let the total no. of students be x

x-70x/100=504
30x/100=504
x=50400/30
x=1680

there are total 1680 students.

Answer 2

let the number of all std is x
then all std all std = x + 504
then x+ 504 ka 70% = x+1764/5=0
then x = 1764
then the number of boys is 1764- 504=1260