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Volume and Surface Area of Solid Figures

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Aptitude miscellaneous
  1. Three metal cubes of sides 5 cm, 4 cm and 3 cm are melted and recast into a new cube. The length of the edge of this cube, is ?
    1. 6 cm
    2. 8 cm
    3. 10 cm
    4. None of these
Correct Option: A

Volume of new cube = (5)3 + (4)3 + (3)3 cm3
= 126 cm3

Edge of this cube = (6 x 6 x 6)1/3 = 6 cm


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