That is a very simple mathematics question.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 I) x( a# y# u% j J6 y& G
Let x = Male, y = Female, z = Child : z. q# Q" k% @. q! C6 Z6 Y公仔箱論壇6x + 3y + z/2 = 100 Formula 1 : @9 Y: p( o5 s( [3 n- a5 Q$ I+ @7 bx + y + z = 100 Formula 29 _& {# `7 X7 q! h2 O! G
Simplify Formula 2 into z, we get z = 100 - x - y Formula 35.39.217.76. Z, }9 O5 T4 u
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 ( L8 }) K$ G+ M Z! jFormula 4 can change into 11x + 5y = 100 Formula 5 4 S/ @1 z& U$ ^0 y9 x& z# |. U7 B% Stvb now,tvbnow,bttvbIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.公仔箱論壇; Z( S9 x \, A2 }5 ~
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,bttvb) E5 F) F( N0 x: L$ |) w3 T
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 1 e/ n ?5 n" G5.39.217.7611x + 5y = 100 Formula 5
6 ]( n9 g6 b) m; R$ L$ ~# g( `# [8 D
11X must be 0 or multiple of 5 8 ?& M* _! c3 T4 C: _& b" V0 R! ythat meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM