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A solid sphere of mass M and radius R is divided into two unequal parts. The first part has a mass of 8 M 7 and is converted into a uniform disc of radius 2R. The second part is converted into a uniform solid sphere. Let I 1 be the moment of inertia of the disc about its axis and I 2 be the moment of inertia of the new sphere about its axis. The ratio I 1 /I 2 is given by:

1. 65
2. 140
3. 185
4. 285

Correct answer: 140

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