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1. |
Three solid metallic sphere whose radii are 3cm, x cm and 18cm respectively, are melted and recast into a single solid sphere of diameter 38cm. Then find the total surface area of the sphere with radius x cm? |
A. | 300 |
B. | 400 |
C. | 100 |
D. | 200 |
Answer» C. 100 | |