Mathematics · System of Particles and Rotational Motion

A solid sphere of mass M and radius R is split into two pieces of masses 7M8 and M8. The piece of mass 7M8 is converted into a disc of radius 2R and thickness t, having moment of inertia I1 about its central symmetry axis. The other piece is made into a solid sphere having moment of inertia I2 about its diameter. Find the ratio I1I2.