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Math Help - writing equations

  1. #1
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    writing equations

    One seventh of the people with a certain disease show visible symptoms. One in three-hundred people without the disease show false symptoms. One person in one-hundred of the general population shows symptoms of the disease. Let r be the fraction of the general population that has the disease. Write an equation reflecting the above information.
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  2. #2
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    The fraction of the general population that does not have the disease is 1-r, and the fraction of the general population showing symptoms is just the sum of the fraction showing real symptoms and the fraction showing false symptoms:

    \frac{1}{7}r+\frac{1}{300}(1-r)=\frac{1}{100}

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  3. #3
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    nice posting
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