A 3×3 grid contains the numbers 1 to 9, each used once. If every row and every column must have the same sum, what must that sum be?
- A.12
- B.15 ✓
- C.18
- D.20
Explanation: 1 to 9 sum to 45. Split across 3 equal rows, each row sums to 45÷3=15.
Class 6 IMO Mathematics Olympiad practice · HOTS / Achievers · Multi-Concept Achievers
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