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    Question

    A solid circular metallic disc of radius 12 inches and

    thickness 4 inches is melted and shaped into a solid disc of radius 16 inches. What is the thickness of the new disc in inches?
    A 2 Correct Answer Incorrect Answer
    B 2.25 Correct Answer Incorrect Answer
    C 2.50 Correct Answer Incorrect Answer
    D 2.75 Correct Answer Incorrect Answer

    Solution

    Volume of cylinder = volume of disk therefore, πr2h = πr2h h = (12 × 12 × 4)/(16 × 16) = 2.25 inches

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