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UKMT Intermediate Mathematical Challenge, 2015

Geometry Difficulty 2.0 Junior Find the answer United Kingdom

What is the area of the shaded region in the rectangle?

(A) $21\text{ cm}^2$ (B) $22\text{ cm}^2$ (C) $23\text{ cm}^2$ (D) $24\text{ cm}^2$ (E) more information needed

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