That is a very simple mathematics question.tvb now,tvbnow,bttvb h2 N. F, y5 u2 Q1 F0 ~
Let x = Male, y = Female, z = Child ! t+ q. w0 S. F% n4 ]2 ^tvb now,tvbnow,bttvb6x + 3y + z/2 = 100 Formula 15.39.217.765 ~* u5 Z, V9 I) G) u# n$ a3 ]
x + y + z = 100 Formula 2TVBNOW 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。" }3 {$ u' E: K2 ?+ S
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3tvb now,tvbnow,bttvb+ {+ a/ q5 E# @$ S6 ^4 v
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 * N, A+ I2 c6 aFormula 4 can change into 11x + 5y = 100 Formula 5 # w) B& {9 O2 d7 U/ h9 XIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.5.39.217.76! a- b* U9 S# ]- A" I
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.tvb now,tvbnow,bttvb8 l& Z W1 R: h
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 ( G& m7 L @6 q/ E9 S% g9 K
11x + 5y = 100 Formula 5
8 y c+ t9 C0 Z }tvb now,tvbnow,bttvb11X 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。# T! d1 r1 L$ k' L% s
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
( G& m7 L @6 q/ E9 S% g9 K
