That is a very simple mathematics question.公仔箱論壇, F4 O2 Y/ @1 A, B' J
Let x = Male, y = Female, z = Child公仔箱論壇 R) c7 W a4 R" I7 A7 k
6x + 3y + z/2 = 100 Formula 1 7 O/ v- B; \$ \# u- g7 E5.39.217.76x + y + z = 100 Formula 2 2 A1 d4 {& h5 ZSimplify Formula 2 into z, we get z = 100 - x - y Formula 3 + |. D" W1 m' ~+ _3 V: DSub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 * P0 t6 l' K5 w+ x1 O公仔箱論壇Formula 4 can change into 11x + 5y = 100 Formula 5 4 B( r1 h( k" }6 c% \' b9 _7 bIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.+ ^* ? ]$ g2 x1 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." l; u4 u0 t$ f: u5 R
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 2 I9 E/ T. \" T% R& ~5.39.217.760,20,80 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 & j! C* N& U5 v5 B8 p. [' t. r" L }公仔箱論壇11x + 5y = 100 Formula 5
. D. A# G" b" X+ C5.39.217.7611X must be 0 or multiple of 5# C; a3 E" M- \! z$ }
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children ) c3 ^! a! t7 ~' F1 s5 male 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。$ L0 E" g- I, {* X% v, e
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM
