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Question

From a right circular cylinder of radius 10 cm × height 21 cm a right circular cone of same base radius is removed. If the volume of the remaining portion is 4,400 cm3, then the height of the cone removed is

A
15 cm
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B
18 cm
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C
21 cm
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D
24 cm
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Solution

The correct option is C 21 cm
Volume of, cylinder =π(10)221=2, 100πcm3
If h be the height of the cone, then
Volume of cone =13π(10)2h=1003πhcm3
By hypothesis,
2100π1003πh=4,400
(6300100h)π=13,200
6,300100h=13,200×722=4,200
100h=6,3004,200=2,100
h=21 cm

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