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, 2007

Number theory Difficulty 1.0 Junior Find the answer Canada

How many positive whole numbers, including 1, divide exactly into both 40 and 72?

(A) $9$ (B) $12$ (C) $4$ (D) $2$ (E) $5$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.