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11 March, 19:09

Jamar is four times as old as Josh. In 20 years he will be twice as old as Josh. How old is Jamar?

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  1. 11 March, 20:58
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    Simultaneous equations

    Jamar=J

    Josh=j

    4J=j

    20+J=2j

    Then

    4J=j

    -4 (J) = - 4 (2j-20)

    So

    0=-7j+80

    7j=80

    j=80:7
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