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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

The integer $n$ is the mean of the three numbers 17, 23 and $2n$ . What is the sum of the digits of $n$ ?

(A) $4$ (B) $5$ (C) $6$ (D) $7$ (E) $8$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.