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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

Anna is $13$ years old. Her mother Annie is three times as old as Anna. How old will Annie be when Anna is three times as old as she is now?

(A) $13$ (B) $26$ (C) $39$ (D) $52$ (E) $65$

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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.