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    Question

    The volume of a cube is 729 cm 3 . If the cost

    of painting the cube is Rs. 10 per cm 2 , then find the cost of painting five faces of the cube.
    A Rs. 4,860 Correct Answer Incorrect Answer
    B Rs. 4,250 Correct Answer Incorrect Answer
    C Rs. 4,150 Correct Answer Incorrect Answer
    D Rs. 4,400 Correct Answer Incorrect Answer
    E Rs. 4,050 Correct Answer Incorrect Answer

    Solution

    Let the length of the edge of the cube be тАШxтАЩ cm.
    Volume of cube = x 3
    ATQ;
    729 = x 3
    Or, x = 9
    Area of five faces of the cube = 5x 2┬а = 5 ├Ч 9 ├Ч 9 = 405 cm 2
    Required cost = 405 ├Ч 10 = Rs. 4,050

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