That is a very simple mathematics question. # v; t7 ]5 o5 h2 l- Q5.39.217.76Let x = Male, y = Female, z = Child ; R. M" t1 D$ a6x + 3y + z/2 = 100 Formula 13 k" [0 i& k% m" T" l) k
x + y + z = 100 Formula 25.39.217.76% | h0 f# `6 I1 o
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3公仔箱論壇- l2 ?% P& c" z" T( \% @8 q
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 " \7 J* p' ?* NFormula 4 can change into 11x + 5y = 100 Formula 5, p9 T1 u B7 [
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.公仔箱論壇( G3 W4 a3 t1 }( G1 o. @" 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 = 80.5.39.217.763 J4 K" u/ ]4 a6 [
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
man,female,children 6 p2 y& y9 e# v' I, E5.39.217.760,20,80 or 5,9,86作者: RyanC 時間: 2007-10-14 10:46 PM
5.39.217.766 i/ L/ e2 q$ L4 j, a6 T& A
11X must be 0 or multiple of 51 y& Y# h' b. n) e
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children公仔箱論壇+ i; ]* O7 j2 w6 Y
5 male $ [, A4 A! b' T7 v5 p" N
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM