Mathematics · Mensuration
A solid metallic sphere of radius 4 cm is melted and recast into spheres of the radius of 2 cm each. What is the ratio of the surface area of the original sphere to the sum of surface areas of the spheres so formed?
- 11 : 4
- 21 : 2✓
- 32 : 3
- 42 : 1
Correct answer
1 : 2
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