Q. Three solid spheres of radius 3 cm, 4 cm and 5 cm are melted and recasted into a solid sphere. What will be the percentage decrease in the surface area?
A) 14
B) 12
C) 28
D) 16
✔ Correct Answer: 28
Exam Insight
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A) 14
B) 12
C) 28
D) 16
✔ Correct Answer: 28
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