Question
The dimensiens of a piece of iron in the shape of a cuboid are 270 cm x 100 cm x 64 cm . If it is melted and recast into a cube , then the surface area of the cube will be :
Answer: Option D
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Volume of the cube = ( 270 x 100 x 64) `cm^3`
Edge of the = `sqrt(270 xx 100 xx 64) cm` = (3 x 10 x 4) cm = 120 cm
`:.` Surface area = ( 6 x 120 x 120) `cm^2` = 86400`cm^2`
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