Math Olympiad for Elementary | 2021 | Division E | Contest 3 | MOEMS | 3A

Problem: What number replaces :D to make the sentence true? 1 + 3 + 4 + 6 + 6 + 8 + 9 + 11 = 4 x :D

Key: Pairing numbers up so that they all add up to pairs of 12.

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