you need to think harder

來源: 於 2010-01-25 09:48:27 [舊帖] [給我悄悄話] 本文已被閱讀：次

please think harder-
15 x 0.2 = 3
15 x 0.8 = 12

85 x 0.2 = 17
85 x 0.8 = 68

12 out of 12+17 ~= 41%