Question
The volume of two cubes are in the ratio 8 : 27. The ratio of their surface areas is :
Answer: Option B
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Let their edges be a and b . Then ,
`a^3/b^3 = 8/27`
`hArr (a/b)^3 = (2/3)^3`
`hArr a/b = 2/3`
`hArr a^2/b^2 = 4/9`
`hArr (6a^2)/(6b^2) = 4/9` = 4 : 9
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