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Thread: mr b

  1. #1
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    mr b

    Mr brown is four times as old as his son robin. in 6 years time he will be three times old as robin. find robins age?

    4x = 3x + 6?

    help?
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  2. #2
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    I would say


    $\displaystyle \frac{y}{x}=4 \Rightarrow y=4x$

    and

    $\displaystyle \frac{y+6}{x+6}=3$

    giving

    $\displaystyle \frac{4x+6}{x+6}=3$

    $\displaystyle 4x+6=3(x+6)$

    $\displaystyle 4x+6=3x+18$

    can you take it from here?
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