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Math Help - not sure what kind of problem

  1. #1
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    not sure what kind of problem

    givens:
    (a/x) = (b/k)
    (a/2b) = d(3x/k)

    problem;
    Find the vaule of "d"
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  2. #2
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    Quote Originally Posted by mr fantastic View Post
    ..
    May butt in, Mr F.
    The poster, blackdove, titled his post "not sure what kind of problem".

    I played around with his post and I got a numerical result. May I post it?

    givens:
    (a/x) = (b/k)
    (a/2b) = d(3x/k)

    problem;
    Find the vaule of "d"


    From (a/x) = (b/k),
    cross multiply,
    bx = ak

    From the (a /2b) = d(3x /k),
    a/ 2b = 3dx /k
    Cross multiply,
    2b(3dx) = ak
    6bdx = ak

    ak = ak,
    bx = 6bdx
    1 = 6d
    d = 1/6 --------answer.
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  3. #3
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    Quote Originally Posted by ticbol View Post
    May butt in, Mr F.
    The poster, blackdove, titled his post "not sure what kind of problem".

    I played around with his post and I got a numerical result. May I post it?

    givens:
    (a/x) = (b/k)
    (a/2b) = d(3x/k)

    problem;
    Find the vaule of "d"

    From (a/x) = (b/k),
    cross multiply,
    bx = ak

    From the (a /2b) = d(3x /k),
    a/ 2b = 3dx /k
    Cross multiply,
    2b(3dx) = ak
    6bdx = ak

    ak = ak,
    bx = 6bdx
    1 = 6d
    d = 1/6 --------answer.
    Quite right. I should have given it a closer look. In fact, some simple re-arranging gives:

    (1) => a/b = x/k

    (2) => a/b = (6d) x/k

    So clearly 6d = 1 etc.
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