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Bobbie is 1.5 m tall and is standing on the opposite side of the lamp-post from Alan. How far from the lamp-post should she stand so that she casts a shadow of length 3 m?

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