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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Ayeesha had 12 guests aged 6, 7, 8, 9 and 10 at her birthday party. Four of the guests were 6 years old. The most common age was 8 years old. What was the mean age of the guests?

(A) $6$ (B) $6.5$ (C) $7$ (D) $7.5$ (E) $8$

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