That is a very simple mathematics question. X' a" o0 w. m @5.39.217.76Let x = Male, y = Female, z = Child ; }- F8 w9 X# ^, |8 u5.39.217.766x + 3y + z/2 = 100 Formula 1 C: f6 w4 }% q* w9 i
x + y + z = 100 Formula 2公仔箱論壇, Q2 {, F* ]2 f& F& f: Z# S* }
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3 * R1 \9 C- |; o# m公仔箱論壇Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 44 ~6 v2 V6 B) P, A* A
Formula 4 can change into 11x + 5y = 100 Formula 5 4 [4 K! w+ _4 z3 @/ ZIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.tvb now,tvbnow,bttvb6 \6 f2 k. g! A3 N' {0 n* n
And between 0 and 9, only 0 can give me a single number of y. So, x has to be 0 and y have to be 20. Then put x and y back to formula 1, we get z = 80. 5 x5 K5 o* I" ?+ m+ Z( I) XTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。Eventually, the answer is 20 female and 80 children and no male.作者: alan1234 時間: 2007-10-14 12:19 AM 標題: two answers
原帖由 twinsdragon 於 2007-10-13 05:40 PM 發表 ) b+ k. D2 C9 e& F
11x + 5y = 100 Formula 5
5.39.217.76* B$ s D' v+ M9 R6 S8 e8 u& K
11X must be 0 or multiple of 5 % E1 B; Q$ S7 v5.39.217.76that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
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