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    Question

    The volume of a cube is 64 cm³. If the cost of painting

    the cube is Rs. 15 per cm², then find the cost of painting five faces of the cube.
    A Rs 900 Correct Answer Incorrect Answer
    B Rs 1200 Correct Answer Incorrect Answer
    C Rs 750 Correct Answer Incorrect Answer
    D Rs 720 Correct Answer Incorrect Answer

    Solution

    Let the length of the edge of the cube be ‘x’ cm.
    Volume of cube = x³
    ATQ;
    64 = x³
    Or, x = 4
    Area of five faces of the cube = 5x² = 5 × 4 × 4 = 80 cm²
    Required cost = 80 × 15 = Rs. 1,200

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