A cube of edge 5 cm is cut 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



[ A ]    1 : 5
[ B ]    1 : 25 right
[ C ]    1 : 125
[ D ]    1 : 625
Answer : Option B
Explanation :
Required ratio = $6 \times 1 \times 1 \over 6\times 5 \times 5$ = $1 \over 25$ = 1 : 25

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