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    Question

    The volume of a solid cube is 2744 m3. If

    whole cube is to be painted at a rate of Rs. 7.5 per m2, then what will be the cost of painting the cube?
    A Rs. 8820 Correct Answer Incorrect Answer
    B Rs. 8220 Correct Answer Incorrect Answer
    C Rs. 8800 Correct Answer Incorrect Answer
    D Rs. 8920 Correct Answer Incorrect Answer

    Solution

    Let the edge length of the cube = ‘a’ metres Then, volume of the cube = a3 = 2744 So, a = 2744(1/3) = 14 So, total surface area of the cube = 6a2 = 6 × 142 = 1176 m2 So, cost of painting the cube = 1176 × 7.5 = Rs. 8820

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