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    Question

    Determine the volume of a cube if the total cost to

    paint its four walls is Rs. 1280, given that the painting rate is Rs. 5 per square meter.
    A 343 m³ Correct Answer Incorrect Answer
    B 729 m³ Correct Answer Incorrect Answer
    C 216 m³ Correct Answer Incorrect Answer
    D 512 m³ Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let length of side of cubical box be 'x' m Area of four walls = 1280/5 = 256 m2 So, 4x2 = 256 x2 = 64 x = 8 cm Desired volume = 8 X 8 X 8 = 512 m3 Hence, option d.

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