Question

Please answer the question given in the pic

Answer 1

$volume \: of \: sphere = \frac{4\pi {r}^{3} }{3} = \frac{704}{21} \\ \\ \pi {r}^{3} = \frac{704 \times 3}{21 \times 4} \\ \\ {r}^{3} = \frac{2112 \times 7}{84 \times 22} \\ \\ {r}^{3} = 8 \\ \\ r = 2$