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Question

70 cylindrical pillars each of radius 10 cm and height 20 m would require m3 of concrete.

A
4.4
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B
44
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C
0.44
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Solution

The correct option is B 44
It is given that r = 10100 m and h = 20 m.
Volume of cylinder = πr2h.
Volume of concrete required for 1 pillar
= 227 ×10100×10100×20
Volume of concrete required for 70 such pillars
= 70 × 227 ×10100×10100×20
=44 m3

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