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    Question

    The radii of two cylinders are in the ratio of 4 : 5 and

    their heights are in the ratio of 5 : 2. The ratio of their volume is:
    A 9 : 4 Correct Answer Incorrect Answer
    B 2 : 1 Correct Answer Incorrect Answer
    C 9 : 7 Correct Answer Incorrect Answer
    D 8 : 5 Correct Answer Incorrect Answer

    Solution

    The radius of two cylinders is in the ratio of 4: 5 and the heights are in the ratio of 5: 2, r₁: r2 = 4:5 and h₁: h2 = 5:2 Volume of cylinder = πr²h   V1: V2 = πr₁2 h₁: πr22 h2 V1: V2 = 16 × 5: 25 × 2 V1: V2 = 80:50 V1: V2 =8:5

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