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4 July, 13:28

Jan is as old now as Gary was $15$ years ago. Six years from now, Gary will be twice as old as Jan will be then. How old is Gary now?

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  1. 4 July, 15:34
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    (1) J=G-15

    G+6=2 (J+6), G+6=2J+12, (2) G=2J+6

    (2) substitute in (1)

    J=2J+6-15

    -J=-9

    J=9

    9=G-15

    G=24 now Gary
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