A cube of edge 5 cm is divided into cubes each of edge 1 cm. The ratio of the total surface area of one of the small cubes to that of the large cube is equal to:

1:5

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1:25

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1:125

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1:625

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1:3125

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Solution

The correct option is B
1:25

Required ratio = $\frac{6 \times 1 \times 1}{6 \times 5 \times 5} = \frac{1}{25}$ = 1:25

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