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本題由lindy提供
Alice's take-home pay last year was the same each month,
(A)1/2
(B)1/3
(C)1/4
(D)1/5
(E)1/6
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答案：
D
Alice去年的?
??入每月一樣，她每月都會存下同樣多的錢
年末，她存下的錢，是她每月收入中沒存的錢的三倍
她去年省下的所有錢都是來自她的收入，她每月省下了收入的分?jǐn)?shù)？
設(shè)月薪y(tǒng)，所求為 X，12*y*X=3*（y—y*X），X=1/5 
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