A candidate scores 20% and fails by 50 marks, while another

A candidate scores 20% and fails by 50 marks, while another candidate who score 40% marks, gests 30 marks more than the minimun required marks to pass the examination. Find the maximum marks for the examination.

Let the maximum marks be N.

According to the question,
(20N/100) + 50 = (40N/100) - 30
⇒ 20N/100 = 80
∴ N = (80 x 100)/20 = 400