Let the number of failed students be x
=> Number of passed students = 4x
So total number of students was 5x
From the given data,
If total number of students be 5x – 35
=> 4x-35-9/x+9 = 2/1
=> 4x – 44 = 2(x + 9)
=> 4x – 2x = 18 + 44
=> x = 31
Total number = 31×5
= 155
