Explanation:
here's your solution
=> total number of student = 575
=> let the number of boys be x
=> then the number of girls = x + 54
=> a/q , x + x + 54 = 575
=>.2x + 54 = 575
=>. 2x = 575 - 54
=> 2x = 521
=> x = 521/2
=> x = 260.5
=> number of girls = 260.5+ 54.
=> 314.5