Three smaller cubes of sides 3, 4 and 5 cm are melted and the molten material is cast into a single large cube. What is the ratio of the total surface area of the smaller cube to the surface area of the larger cube?

Three smaller cubes of sides 3, 4 and 5 cm are melted and the molten material is cast into a single large cube. What is the ratio of the total surface area of the smaller cube to the surface area of the larger cube?
1). 5 :4
2). 6 :5
3). 17 :1 5
4). 25 :1 8

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