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Number theory Difficulty 2.0 Junior Find the answer United Kingdom

What is the largest possible remainder that is obtained when a two-digit number is divided by the sum of its digits?

(A) $13$ (B) $14$ (C) $15$ (D) $16$ (E) $17$

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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.