When a student score 30% marks, he fails by 5 marks. But when he scores 40% marks he got 10 more marks than passing marks. Find passing percentage.

33\(\frac{1}{3}\)%

Let total marks = x

ATQ,    x × 10 % = 15

                     x   = 150

30 % of 150 = 45 (He fails by 5 marks so passing marks are 45 + 5 = 50)

Passing percentage = \(\frac{50}{150}\) × 100 = 33\(\frac{1}{3}\) %