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Practice mode Volume and Surface Area

Three solid metal cubes of edges 1 cm, 6 cm and 8 cm are melted together to form a single cube. What is the edge of the new cube?

Correct answer C. 9 cm

Explanation

Total volume = 1 + 216 + 512 = 729 cu cm. Edge of new cube = cube root of 729 = 9 cm. Adding edges (15 cm) is wrong.

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