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A father is now three times as old as his son, twelve years ago he was six times as old as his son. how old are the son and the father?

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  1. now:
    son ---- x
    father -- 3x

    12 years ago:
    son = x-12
    father = 3x-12

    3x-12 = 3(x-12)

    solve for x

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  2. 24

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