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Algebra Difficulty 1.0 Junior Find the answer Canada

The perimeter of a rectangular field is 3 times its length. If the perimeter is 240 m, the width of the field is

(A) $80\text{ m}$ (B) $40\text{ m}$ (C) $20\text{ m}$ (D) $30\text{ m}$ (E) $120\text{ m}$

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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.