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Multiple Choice Questions

Three solid of cubes of sides 1cm 6cm and 8 cm are melted to form a new cube Find the total surface ...........

Quantitative Aptitude ( CCS) Mensuration 3D

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Three solid of cubes of sides 1cm, 6cm and 8 cm are melted to form a new cube. Find the total surface area of the cube so formed.

128 cm²

346 cm²

486 cm²

524 cm²

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Explanation:

Volume of new cube = (1³ + 6³ + 8³) cm³⇒ 729 cm³
Edge of new cube = ³√729 cm ⇒ 9cm.
∴ Total surface area of the new cube = (6 × 9 × 9) cm²⇒ 486 cm².

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