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A well is 6 m deep. …

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A well is 6 m deep. The cost of cementing its inner surface at 50 paise per dm square is 1320 rupees. Determine the diameter of the wall.

Posted by Kalyan Mohapatra 7 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Astha Gupta 7 years, 9 months ago

Inner area = 1320/(50/100) = 1320/0.5 = 2640dm^2 In m^2, 26.4m^2 Inner CSA of well = 2πrh 26.4 m^2 = 2×22/7×r×6 26.4 = 44/7×r×6 26.4×7 = 44×r×6 184.8 = 264×r 264×r = 184.8 r = 184.8/264 r = 0.7m Diameter = 2r = 2×0.7 = 1.4m

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