$$0.824 = \frac{n/20\cdot 1}{n/20\cdot 1+(1-n/20)\cdot 0.5}$$
Please answer this question with step by step. Thank you so much
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3This site is a place to get help. Not a service for doing math problems (while showing steps!) for free. What have you done yourself to try to solve for $n$? What specifically is your difficulty with this problem? – Mike Pierce Feb 10 '16 at 05:04
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2Be a math smarty and show your progress; it's the best way to learn! :) Formatting tips here. – Em. Feb 10 '16 at 05:10
