A) 8
B) 10
C) 14
D) 18
E) None of these
Correct Answer: B
Solution :
Explanation Option [b] is correct. \[\frac{4}{2}\pi \,{{5}^{3}}+\frac{4}{3}\pi {{.8}^{3}}+\frac{4}{3}\pi {{r}^{3}}=\frac{4}{3}\pi {{(12)}^{3}}\] \[\therefore \,\,125+512+{{R}^{3}}=1728\] \[{{\operatorname{R}}^{3}}=1091\] \[\therefore R\,=10\,(approx)\]
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