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Question

A big iron boiler tank opened on top is cylindrical in shape.It has height is 10 m and radius is 7m. It gets corroded at a rate of 3 sq. meter/day. The number of days in which it totally gets corroded is: (Take pi=227)



A

192

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B

202

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C

198

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D

208

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Solution

The correct option is C

198


Surface area of the boiler = Curved Surface area + Bottom area 

= 2πrh + πr2 = 594 sq. meter

Total no. of days = 5943 = 198


Mathematics

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