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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

On Aoife's 16th birthday, Buster was three times her age. On Aoife's 21st birthday, how old was Buster?

(A) $32$ (B) $48$ (C) $53$ (D) $63$ (E) $64$

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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.