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    Question

    The volume of a solid cube is 1728 m3. If

    whole cube is to be painted at a rate of Rs. 6.5 per m2, then what will be the cost of painting the cube?
    A Rs. 5820 Correct Answer Incorrect Answer
    B Rs. 5616 Correct Answer Incorrect Answer
    C Rs. 5800 Correct Answer Incorrect Answer
    D Rs. 5920 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the edge length of the cube = ‘a’ metres Then, volume of the cube = a3 = 1728 So, a = 1728(1/3) = 12 So, total surface area of the cube = 6a2 = 6 × 122 = 864 m2 So, cost of painting the cube = 864 × 6.5 = Rs. 5616

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