That is a very simple mathematics question.tvb now,tvbnow,bttvb+ T/ ~2 z5 U) _. p0 u9 L
Let x = Male, y = Female, z = Child5.39.217.77' e1 r8 _; E9 | _ _$ x# t
6x + 3y + z/2 = 100 Formula 1 " a! T! p& R& i! p$ q; [tvb now,tvbnow,bttvbx + y + z = 100 Formula 2 3 {$ m. E' S# L& r* gSimplify Formula 2 into z, we get z = 100 - x - y Formula 3公仔箱論壇! [4 f4 _! i" l( E5 C: S6 I U4 U
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4公仔箱論壇+ H" j8 H |- R5 x' u6 ~0 ^! a
Formula 4 can change into 11x + 5y = 100 Formula 5公仔箱論壇* i9 L- P) Y; \; D8 i
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want. 7 q' ]0 Z4 v5 p9 U2 XAnd 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 = 80.1 [# I# E/ Q$ u' W/ `% ^
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 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。: H/ l* K) ^: y, k8 M
11x + 5y = 100 Formula 5
8 B' C/ Z6 C, \/ `8 ]/ f, ?5 cTVBNOW 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。11X must be 0 or multiple of 5 4 _! @) h" }& N( H' Y/ }that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children5.39.217.77; @( `1 g$ `" S+ Y% Z( L
5 male 5.39.217.771 [/ j4 u' Z |! B. h9 H+ x% T4 [
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM