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Small cone cut off a cone by a plane parallel to the base with a given fraction of volume: find the height of the cut

The same question, asked 2 times: CDS 2 2016*, CDS 2 2022. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    CDS 2 2016

    58
    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 164\frac{1}{64} the volume of original cone. What is the height from the base at which the section is made ?

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  2. Question 2

    CDS 2 2022

    81
    The height of a cone is 30 cm. A small cone is cut off at the top by a plane parallel to its base. If its volume is 127\frac{1}{27} of the volume of the given cone, then what is the height of the frustum of the cone ?

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