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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

The sum of the ages of three children, Ava, Bob and Carlo, is $31$ . What will the sum of their ages be in three years' time?

(A) $34$ (B) $37$ (C) $39$ (D) $40$ (E) $43$

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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.