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in Mensuration by (65.5k points)

Find the cost of whitewashing the four walls of a cubical room of side 4m at the rate of Rs.20/m2.

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Best answer

l = 4m 

Area to be white washed = L.S.A of cube 

= 4l2 = 4 × 42 = 4 × 16 = 64 m2 

cost of white washing 1m2 = 20 

∴ The cost of white washing 64m2 = 64 × 20 = Rs. 1280.

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