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The height of a cone is 60 cm. A small c...

The height of a cone is 60 cm. A small cone is cut off at the top by a plane parallel to the base and its volume is `1/64` the volume of original cone. What is the height from the base at which the section is made ?

A

15 cm

B

20 cm

C

30 cm

D

45 cm

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