the no . of girls in a class are 7 times the no . of boys , which value cannever be the of total students ?
let the boys are x , then girls are 7 x , total = x + 7 x = 8 x so it should be multiple of 8 , 30 is not a multiple of 8 . c
subtract(multiply(add(7, const_1), const_4), const_2)