That is a very simple mathematics question.tvb now,tvbnow,bttvb4 C4 _) ?: T% ^$ E: u ~- l+ ?
Let x = Male, y = Female, z = Childtvb now,tvbnow,bttvb9 o4 e) X9 w& R
6x + 3y + z/2 = 100 Formula 1TVBNOW 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。) X% a9 @" W: h) l
x + y + z = 100 Formula 2 6 U# E E M4 L0 Q# N5 vSimplify Formula 2 into z, we get z = 100 - x - y Formula 3 + Q' H; h7 M4 {( U) K$ m) Z* h$ w公仔箱論壇Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 $ X4 O" c" }' b4 p5.39.217.76Formula 4 can change into 11x + 5y = 100 Formula 5公仔箱論壇$ y& g2 k- T) B5 }" R& D
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.& r: C! u2 Q9 ~( c% y
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. 9 k4 m# P9 m3 T9 E) r* T# s u5.39.217.76Eventually, 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
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0,20,80 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 5.39.217.76- Q: t7 I# W2 v4 V. H# q8 e
11x + 5y = 100 Formula 5
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11X must be 0 or multiple of 5tvb now,tvbnow,bttvb# O0 `/ D; [7 r2 A
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM