100人搬100塊磚8 z4 U( R3 d" w6 Q' I' g6 l
規則 : H* {! |" _, a0 x# r# S! @只何用100人搬100塊磚,不能多也不能小...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。6 ^$ _- ]$ I) X E/ w2 ]
100人當中有男人、女人同細路仔5.39.217.76: _$ M4 ^! ~- ]- g/ {& @
1個男人搬6塊磚 , N# Y1 w ?( ]: t1 P5 x: {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。1女人搬3塊磚 " d" w c" W v, m- l' h1 b公仔箱論壇2個細路仔搬1塊磚 ' a1 g7 h% Y. K# Q# _公仔箱論壇**************************************************************5.39.217.76' t- P' k. ^& ?! i/ a7 R
問搬100塊磚 / \! w# b) D9 f' a/ r: M& a要幾多男人、女人同細路仔/ G) j+ j; L2 E. `: _3 l/ f
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答案30號公佈 . F Q& _8 G" X, d公仔箱論壇 ) ~& J* M* C6 Q+ b( R7 B: [ h5.39.217.76[ 本帖最後由 1/5 於 2007-10-13 05:10 PM 編輯 ]作者: twinsdragon 時間: 2007-10-13 05:40 PM
That is a very simple mathematics question.5.39.217.76- j& k6 E% V1 a- c7 C2 R& E
Let x = Male, y = Female, z = Child $ f$ m. t, V% K. P( C- X2 z5.39.217.766x + 3y + z/2 = 100 Formula 1公仔箱論壇: z: D# l; A0 X
x + y + z = 100 Formula 2tvb now,tvbnow,bttvb4 i/ P) T0 {- U& s
Simplify Formula 2 into z, we get z = 100 - x - y Formula 35.39.217.768 H$ ?, R; M# m$ e
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4tvb now,tvbnow,bttvb7 R; h( |: p2 }
Formula 4 can change into 11x + 5y = 100 Formula 5 $ F% v1 A# ]* a5 g* U5 _& gIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.公仔箱論壇& z8 s3 f- ?' g6 g0 j6 j
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. % I. G$ n* k n* |5.39.217.76Eventually, 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
0 q- `3 N! u- }. P2 Ntvb now,tvbnow,bttvb11X must be 0 or multiple of 5tvb now,tvbnow,bttvb- S- f: N( a- K) h" X
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
