If a solid cone of volume 27π cm³ is kept inside

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If a solid cone of volume 27π cm³ is kept inside a hollow cylinder whose radius and height are that of the cone, then the volume of water needed to fill the empty space is

1. 3π cm³
2. 18π cm³
3. 54π cm³
4. 8l π cm³

Correct Option: C

Volume of required water = 2 × volume of cone
= 2 × 27π = 54π cu.cm