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Question

The circular ends of a bucket are of radii 35 cm and 14 cm and the height of the bucket is 40 cm. Its volume is
(a) 60060 cm3
(b) 80080 cm3
(c) 70040 cm3
(d) 80160 cm3

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Solution

(b) 80080 cm3
Let R and r be the radii of the top and base of the bucket, respectively, and let h be its height.

Then,

R=35 cm, r=14 cm, h=40 cm
Volume of the bucket = Volume of the frustum of the cone
=13πhR2+r2+Rr cm3
=13×227×40×352+142+35×14 cm3=88021×1911 cm3=80080 cm3
Hence, the volume of the bucket is 80080 cm3.

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