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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

Dad says he is exactly 35 years old, not counting weekends. How old is he really?

(A) $40$ (B) $42$ (C) $45$ (D) $49$ (E) $56$

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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.