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student12688

last year, there were 30 male member and 20 female member in a chess club. this year, the number of male member is decrease by r% while the number of female is increase by r%. if the number of male member is equal to that of female member this year.

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  • 解數雜貨店
    2020-08-09 14:31:19
    30(1-r/100) = 20(1+r/100)
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