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    Question

    If the radius of a hemispherical balloon increases from

    4 cm to 7 cm as air is pumped into it, find the ratio of the surface area of the new balloon to its original.
    A 16 : 21 Correct Answer Incorrect Answer
    B 49 : 16 Correct Answer Incorrect Answer
    C 20 : 49 Correct Answer Incorrect Answer
    D 21 : 12 Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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