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    Question

    How many bullets can be made out of a lead cylinder 32cm

    high and 12 cm radius, each bullet being 4 cm in diameter?
    A 1750 Correct Answer Incorrect Answer
    B 2250 Correct Answer Incorrect Answer
    C 1125 Correct Answer Incorrect Answer
    D 432 Correct Answer Incorrect Answer

    Solution

    Volume of cylinder = π x  r2  x h = π x 122  x 32  = 14482.3 cm3    & Volume of each bullet = (4/3) x π x 23  = 704/21 cm 3   So number of bullets = Volume of cylider/volume of 1 bullet = 14482.3/(704/21) = 432

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