In an examination, 80% of students passed in English, 70% of students passed in Hindi and 15% failed in both the subjects. What is the percentage of students who failed in only one subject?
A
15%
B
20%
C
25%
D
35%
Correct Answer: Option B
Explanation
To solve this in the most elegant way, I will apply the **Domain Inversion** strategy seen in the 2015 PYQ [55]. The question asks about 'failures', so I should not waste time calculating 'passes'.
**Step 1: Flip the Data to 'Failures'**
- T