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Geometry Difficulty 1.0 Junior Find the answer United Kingdom

Ben has exactly the right number of cubes, each of side $5$ cm, to make a solid cube of side $1$ m. He places the smaller cubes side by side to form a single row. How long is this row?

(A) $5$ km (B) $400$ m (C) $300$ m (D) $20$ m (E) $1$ m

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