Question
The volume of a solid cube is 1000 m3. If
whole cube is to be painted at a rate of Rs. 6 per m2, then what will be the cost of painting the cube?Solution
Let the edge length of the cube = βaβ metres Then, volume of the cube = a3 = 1000 So, a = 1000(1/3) = 10 So, total surface area of the cube = 6a2 = 6 Γ 102 = 600 m2 So, cost of painting the cube = 600 Γ 6 = Rs. 3600
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