Correct Answer - Option 1 : 25%
Calculation:
Let total marks of exam be n and passing marks be m.
⇒ 20/100 × n = m - 30
⇒ n = 5m - 150
⇒ 32/100 × n = m + 42
Solving,
⇒ 8/25 × (5m - 150) = m + 42
⇒ 40m - 1200 = 25m + 1050
⇒ m = 150
Total marks = 5 × 150 - 150 = 600
∴ Passing percentage = 150/600 × 100 = 25%