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 4,400cm3, 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 C21 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, 2100π−1003πh=4,400 ⇒(6300−100h)π=13,200 ⇒6,300−100h=13,200×722=4,200 ⇒100h=6,300−4,200=2,100 ⇒h=21 cm