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A metallic hemisphere has radius '66 cm'...

A metallic hemisphere has radius '66 cm'. It is made up of a metal 'X'. To increạse its weight, a conical hole is drilled and is completely filled with metal Y.
The conical hole has.a radius of '2 cm' and depth '7/2 cm'.
(a) Find the volume of the conical part.
(b) Calculate the ratio of the volume of metal 'X' to the volume of metal 'Y'.

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