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John is 3 times as old as Susan now. In 4 years time John will be 18 years older than Susan. Find John's age and Susan;s age now.

  • maths -

    present ages:
    Susan --- x
    John ---- 3x

    Four years from now:
    Susan -- x+4
    John --- 3x + 4

    3x+4 = x+4 + 18
    2x = 18
    x = 9

    Susan is now 9 and John is now 27

    check:
    in four years:
    Susan = 13, John is 31
    is 31 greater than 13 by 18 ? YES!!

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