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    Question

    The volume of a cube is 4096 cm³. If the cost of

    painting the cube is Rs. 4 per cm², then find the cost of painting five faces of the cube.
    A Rs. 5,120 Correct Answer Incorrect Answer
    B Rs. 4,120 Correct Answer Incorrect Answer
    C Rs. 4,500 Correct Answer Incorrect Answer
    D Rs. 4,600 Correct Answer Incorrect Answer

    Solution

    Let the length of the edge of the cube be ‘x’ cm.
    Volume of cube = x³
    ATQ;
    4096 = x³
    Or, x = 16
    Area of five faces of the cube = 5x² = 5 × 16 × 16 = 1280 cm²
    Required cost = 1280 × 4 = Rs. 5,120

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