How many students like exactly one of the two pets (not both)?
- A.23
- B.30 ✓
- C.35
- D.17
Explanation: 'Exactly one' means only the two outer regions, excluding the overlap: 18 (only Dogs) + 12 (only Cats) = 30.
Class 6 IMO Mathematics Olympiad practice · Data & Measurement · Data Handling & Presentation
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