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<p>A, B and C are disc, solid sphere and spherical shell respectively with same radii and masses. These masses are placed as shown in figure.</p>

<p><img alt="" src="https://school.achievam.com/upload/questionbank/question/que_1759567243.PNG" style="height:138px; width:144px" /></p>

<p>The moment of inertia of the given system about PQ axis is&nbsp;<span class="equation">\(\frac{x}{15}\)</span>​​​​​​​I , where I is the moment of inertia of the disc about its diameter. The value of x&nbsp; is ____________.</p>