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Number theory Difficulty 1.0 Junior Find the answer United Kingdom

When the positive integer $x$ is divided by 6, the remainder is 3. What is the remainder when $3x$ is divided by 6?

(A) $4$ (B) $3$ (C) $2$ (D) $1$ (E) $0$

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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.