Quantitative Aptitude Mensuration Solid Figures

A solid metallic sphere of radius 15 cm is melted and recast into spherical balls of radius 3 cm each. What is the ratio of the surface area of original sphere and sum of the surface areas of all the balls?

1

1 : 10

2

1 : 5

3

5 : 27

4

3 : 40

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