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    Question

    The ratio of weights of two spheres of different

    materials is 8:17 and the ratio of the weights per same of materials of each is 289:64. The ratio of radius of the two spheres is.
    A 5:12 Correct Answer Incorrect Answer
    B 8:17 Correct Answer Incorrect Answer
    C 9:5 Correct Answer Incorrect Answer
    D 3:7 Correct Answer Incorrect Answer

    Solution

    Density = mass / volume Ratio of the volumes of spheres = (8/289)/ (17/64) = (8×64)/17×289 4/3 πr13 /4/3 πr23 = 512/17×289 r1: r2 =8:17

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