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Algebra Difficulty 1.0 Junior Find the answer Canada

In a jar, the ratio of the number of oatmeal cookies to the number of chocolate chip cookies is $5:2$ . If there are 20 oatmeal cookies, the number of chocolate chip cookies in the jar is

(A) $28$ (B) $50$ (C) $8$ (D) $12$ (E) $18$

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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.