Question
The volume of a solid cube is 729 m3. If
whole cube is to be painted at a rate of Rs. 8 per m2, then what will be the cost of painting the cube?Solution
Let the edge length of the cube = ‘a’ metres Then, volume of the cube = a3 = 729 So, a = 729(1/3) = 9 So, total surface area of the cube = 6a2 = 6 × 92 = 486 m2 So, cost of painting the cube = 486 × 8 = Rs. 3888
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