That is a very simple mathematics question.+ _/ U; J0 _. `3 c5 V/ x% o
Let x = Male, y = Female, z = Child 8 {% ~% r. C" D% RTVBNOW 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。6x + 3y + z/2 = 100 Formula 1 # a1 J' H; S7 {公仔箱論壇x + y + z = 100 Formula 2 9 j3 `8 r, A7 C# S, ~( ?5.39.217.76Simplify Formula 2 into z, we get z = 100 - x - y Formula 3 b; s" \2 y0 z% `6 w) O1 Y/ U0 D9 LSub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 48 d @, h1 X' t$ k: G* M2 P
Formula 4 can change into 11x + 5y = 100 Formula 5 5 Y M N& ~- Q% v8 e% w2 k: b公仔箱論壇In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.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 U( k. t& X0 q8 e! I! r2 K6 F
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.& {2 y) U- ^$ N; G
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 f4 Q) U. O6 t b' e( X( n: m
11x + 5y = 100 Formula 5
% ^5 W: X5 J2 f0 GTVBNOW 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 5 q- \- O& Y- O: o% A- g9 \$ Q) dthat meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children5.39.217.76; T3 C5 f# c X, s7 z
5 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。# u" m/ i5 b" O& o, G0 y
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM