Explanation:

Let the maximum marks be x
Given :
Total pass percentage = 35% of x
Student got 57 marks and failed by 13 marks. 
Therefore, Total Marks to pass exam = 57 + 13 = 70
=> 35% of x = 70
=> 0.35 × x = 70
=> 0.35x = 70
=> x = 70/0.35 = 200
Hence,
Maximum marks = 20