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    ybingham's Avatar
    ybingham Posts: 4, Reputation: 1
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    #1

    Oct 9, 2007, 12:18 PM
    algebra word
    Bjørn is 3 years older than Icar was 5 years ago. If the sum of their ages now is 66, how is each person?
    sGt HarDKorE's Avatar
    sGt HarDKorE Posts: 656, Reputation: 98
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    #2

    Oct 9, 2007, 12:30 PM
    You use process of substitution so you need two equations:

    1.)x+y=66

    2.) Bjorn(x)=(y-5)+3 (Icar represents y, and Bjørn represents x if you didn't catch that.)


    Plug (y-5)+3 in for X:
    ((y-5)+3)+y=66
    y-5+3+y=66
    y-2+y=66
    2y-2=66
    2y=68
    y=34

    Plug 34 for in for Y to get X:
    (34-5)+3=32

    Icar is 34
    Bjørn is 32
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