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13 June, 20:19

Kathy is 6 years younger the Bill. Twelve years ago, Bill was twice as old as kathy was then. How old are they now?

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  1. 13 June, 20:35
    0
    k = Kathy's age now

    b = Bill's age now

    (1) k=b-6

    (2) b-12=2 x (k-12)

    (2) b-12=2k-24

    (2) 2k-b=12

    From (1)

    (1) - k+b=12

    Add (1) and (2)

    k=18

    and

    (1) k=b-6

    18=b-6

    b=24

    Kathy is 18 and Bill is 24

    check:

    (2) b-12=2 x) k-12)

    24-12=2 x (18-12)

    12=12

    OK
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