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    Question

    The inner radius of a hollow cylindrical tank is 6 cm. If

    the height of the tank and the thickness of the walls are 25 cm and 3 cm, respectively, calculate the volume of the tank. (Use π = 22/7)
    A 1290 cm³ Correct Answer Incorrect Answer
    B 1850 cm³ Correct Answer Incorrect Answer
    C 1488 cm³ Correct Answer Incorrect Answer
    D 1785 cm³ Correct Answer Incorrect Answer

    Solution

    ATQ,

    Outer radius of the tank = 6 + 3 = 9 cm

    Volume of the hollow tank = π × height × [(outer radius)² - (inner radius)²]

    = (22/7) × 25 × (9² - 6²)

    = (22/7) × 25 × (81 - 36)

    = (22/7) × 25 × 45

    = 1,785 cm³

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