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  1. If a: b = 3:4, b:c = 7:9, c:d = 5:7, find a:d?
    2. A.
    5:12
    B.
    7:12
    C.
    3:11
    D.
    5:11

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    Answer : Option A

    Explanation :

    a/d = (3/4)*(7/9)*(5/7) => 5/12

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