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Geometry Difficulty 1.0 Junior Find the answer United Kingdom

A square piece of card has perimeter $20$ cm. Charlie cuts the card into two rectangles. The perimeter of one of the rectangles is $16$ cm. What is the perimeter of the other rectangle?

(A) $4$ cm (B) $8$ cm (C) $10$ cm (D) $12$ cm (E) $14$ cm

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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.