That is a very simple mathematics question. ; L9 p! n- z9 `, p6 e3 v' Ftvb now,tvbnow,bttvbLet x = Male, y = Female, z = Child公仔箱論壇& t/ F& H: l, Q, [
6x + 3y + z/2 = 100 Formula 1" s, {( l& w' X" j/ a
x + y + z = 100 Formula 2 ) j# B# E9 ]! B" _- k公仔箱論壇Simplify Formula 2 into z, we get z = 100 - x - y Formula 3* J* ^$ L( I9 a: V8 q
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4tvb now,tvbnow,bttvb. f9 {* v4 L2 y
Formula 4 can change into 11x + 5y = 100 Formula 5 " s' |9 f2 M0 h1 c' sTVBNOW 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。In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.公仔箱論壇( N6 P1 D. |/ p( 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 = 80.2 m0 A9 }6 y5 a: I/ I) U$ x
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 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。) \' C: C) [6 R5 p
11x + 5y = 100 Formula 5
& W: C5 E% ]. W1 L7 ?. h# j! @公仔箱論壇11X must be 0 or multiple of 5 1 I3 S8 d2 U) R& N4 H9 Q* gthat meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children ' e. Z/ d, w( S: c( Q: pTVBNOW 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。5 male , k0 W9 D4 \7 T0 U
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM