The axis X and Z in the plane of a disc are mutually perpendicular and ​Y-axis is perpendicular to the plane of the disc. If moment of inertia of the body about X and Y axes is 30 and 40 then moment of inertia about Z-axis will be? 

According to perpendicular axix theorem: Iz = Ix + Iy.
==> Iz = 30+40 = 70
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