# 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 [ 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