Physics - Rotation Question with Solution | TestHub

A circular disc $X$ of radius $R$ is made from an iron plate of thickness $t$, and another disc $Y$ of radius $4\mathrm{R}$ is made from an iron plate of thickness $\frac{\mathrm{t}}{4}$. Then the relation between the moment of inertia ${\mathrm{I}}_{\mathrm{X}}$ and ${\mathrm{I}}_{\mathrm{Y}}$ is