Mathematics

Problem

Assume

\pi=\frac{22}{7}

, unless stated otherwise. 9. Twenty seven solid iron spheres, each of radius

r

and surface area S are melted to form a sphere with surface area

\mathrm{S}^{\prime}

. Find the (i) radius

r^{\prime}

of the new sphere, (ii) ratio of S and

\mathrm{S}^{\prime}