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