How many people like only Tea (and not Coffee)?
- A.9
- B.12 ✓
- C.15
- D.18
Explanation: The 'only Tea' region (not overlapping with Coffee) already shows 12 — no further calculation is needed. Remember: the overlapping middle region represents 'both', not 'either'.
Class 6 IMO Mathematics Olympiad practice · Data & Measurement · Data Handling & Presentation
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