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Math Help - Ratio Algebra stuff

  1. #1
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    Ratio Algebra stuff

    If a=2b, 3b=4c, 5c=6d, what is the ratio of a to d?

    The answer given in the book is: 16/5

    The answer I got is 5/16.

    This is how I got my answer, can you tell me where I went wrong?

    a=2b
    3b=4c
    5c=6d

    3a=6b=8c

    15a=30b=40c=80d

    15a=80d

    5a=16d

    THEREFORE: the ratio of a to do is 5/16
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  2. #2
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    Quote Originally Posted by juliak View Post

    5a=16d

    THEREFORE: the ratio of a to do is 5/16

     5a=16d

     a=\frac{16d}{5}

     \frac{a}{d}=\frac{16}{5}
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