Let the each side of cube be S and radius of sphere be r Volume of cube = S3 According to question r = \(\frac{S}{2}\) = \(\frac{Volume of cube}{Volume of sphere}\) = \(\frac{S^3}{\frac{4}{3} × \frac{22}{7} × \frac{x^3}{8}}\) = \(\frac{21}{11}\) So the correct option is (B)