That is a very simple mathematics question. + m! P I8 o. E- M8 J& v3 W! S+ rLet x = Male, y = Female, z = Child 3 d6 G! q0 f& d3 v/ }. Mtvb now,tvbnow,bttvb6x + 3y + z/2 = 100 Formula 1 7 a4 r/ l) U8 g! h/ htvb now,tvbnow,bttvbx + y + z = 100 Formula 2 6 R* A; L; m6 [5 e" L) D8 U2 u公仔箱論壇Simplify Formula 2 into z, we get z = 100 - x - y Formula 3 ! ~( X( p: X9 M9 ~0 vSub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 ; H4 j3 G6 `1 X5 \" `" f! O0 ?: UTVBNOW 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 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。) c. K* L2 p: m/ b
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want. + {' s" \ r1 `& [% w公仔箱論壇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. ( q2 l: B2 @- p9 W( E" A5.39.217.77:8898Eventually, 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 9 s( z. B2 w5 [/ _5.39.217.77:889811x + 5y = 100 Formula 5
4 e1 z F f. G8 p0 `' Q9 Z" htvb now,tvbnow,bttvb11X must be 0 or multiple of 5: X! h5 D# ]* `- m
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children . y" i1 I# ~) [5 male 5.39.217.77:8898$ e1 |! |0 t8 Z2 r$ T K% T
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM