That is a very simple mathematics question.公仔箱論壇" M: J1 T; d' n9 @" p
Let x = Male, y = Female, z = Child公仔箱論壇7 V0 Q' s; v/ ?! ~
6x + 3y + z/2 = 100 Formula 1TVBNOW 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。, k) L5 o% d: N1 ~9 i" |% h$ B! R4 z
x + y + z = 100 Formula 21 u) ~ s& V& V; ^
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3 % g# p& j$ E) `3 [Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4tvb now,tvbnow,bttvb* u% w! f5 \; h0 L; t2 h
Formula 4 can change into 11x + 5y = 100 Formula 5 " H" o/ @1 ?% n* U# zIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want. # F% }/ R( Q: W" j) k+ T6 R. w! RAnd 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. % ^' r, c& y8 M3 wtvb now,tvbnow,bttvbEventually, 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 $ Q2 z2 }; I( a9 M \6 j' n' m
11x + 5y = 100 Formula 5
tvb now,tvbnow,bttvb- A/ s/ u6 r! Z
11X must be 0 or multiple of 5 8 u. B1 y& e9 N/ v公仔箱論壇that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children 6 Z+ O2 a2 ] }: e! }2 z- B( P5 male TVBNOW 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。$ S! ]/ O" m* c Z. L
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM
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