That is a very simple mathematics question. % I. u0 v0 p* e. `tvb now,tvbnow,bttvbLet x = Male, y = Female, z = Child $ |6 S m4 a" c; ~* Etvb now,tvbnow,bttvb6x + 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。" x0 ]: \( O9 j; K1 t- h. {
x + y + z = 100 Formula 2# x$ y9 r( V* X2 `
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3TVBNOW 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。: D. t3 K, ~* S0 u
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 ( B) X+ o( l! rFormula 4 can change into 11x + 5y = 100 Formula 5TVBNOW 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。. j5 a+ W8 }* M3 G' n
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.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。$ k1 x( C) g5 @. \! R/ S
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.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。: G6 c! y3 Y; m P& \* c. K
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
man,female,children 1 ^1 C- O) e, T6 J* oTVBNOW 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。0,20,80 or 5,9,86作者: RyanC 時間: 2007-10-14 10:46 PM
原帖由 twinsdragon 於 2007-10-13 05:40 PM 發表 4 i9 W6 a7 _3 b. G: T: Z# R
11x + 5y = 100 Formula 5
% p1 n2 q. B' @+ l: P11X must be 0 or multiple of 5 ! x- @- ]: f% j7 [0 d2 o( x5.39.217.76that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM