That is a very simple mathematics question. ( w0 ]! C" ]: Y/ H* WLet x = Male, y = Female, z = Child - M8 W+ F4 h0 D1 S8 W4 w5.39.217.766x + 3y + z/2 = 100 Formula 1tvb now,tvbnow,bttvb5 K1 P( \& y- Q/ ?; }7 J. w
x + y + z = 100 Formula 29 j+ o" {$ Z+ C( Q f) ~
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3tvb now,tvbnow,bttvb, }0 m- \) s9 b1 H
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 ( `7 }* x6 J. t. q, YTVBNOW 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。Formula 4 can change into 11x + 5y = 100 Formula 5公仔箱論壇, N+ H' V1 O% W: m
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.5.39.217.764 r( x: |4 \$ W& r6 U
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. 6 `8 \( _( P( @9 v! Y( U. [7 Ltvb 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 5 T. K. g5 D' m# ]4 N3 t5.39.217.7611x + 5y = 100 Formula 5
公仔箱論壇) t- ^( b2 J) ~5 h) g# l. o9 v. X
11X must be 0 or multiple of 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。8 J. `( [9 j( k, s8 ^2 p$ H
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
