Q.6 A cistern is 25 m long ,17m wide and 8 m high. It is open at the top. Find the cost of cementingthe inside of the cistern at the rate of 12 per m.​

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The answer is 13164 Rs

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==> Length of the cistern (L) = 25 m

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==> Breadth of the cistern (B)= 17 m

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==> Height of the cistern (H) = 8 m

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==>Area of cistern = LB + 2BH + 2HL

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= 25 × 17+ (2 × 17 × 8) + (2 × 8 × 25)

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= 425 + 272 + 400

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==> Area of cistern = 1097 m^2

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Now

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Cost of cementing 1 m^2 area = 12 Rs

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Cost of cementing 1097 m^2 area = 12 × 1097

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= 13164 Rs

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