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UKMT Junior Mathematical Challenge, 2018

Geometry Difficulty 2.0 Junior Find the answer United Kingdom

The areas of the two rectangles in the diagram are $25\text{ cm}^2$ and $13\text{ cm}^2$ as indicated. What is the value of $x$ ?

(A) $3$ (B) $4$ (C) $5$ (D) $6$ (E) $7$

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