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Two cubes have volumes in the ratio 1: 27, The ratio of their surface areas is?

1 : 3
1 : 8
1 : 9
1 : 18

Correct Answer: 1 : 9

Explanation:

Let the volume be x³ and 27x³
∴ Their edges are x and 3x
Now Ratio of their surface area = 6x² : 54x² = 1 : 9

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