That is a very simple mathematics question.
7 J% w# _9 f4 C$ U$ s; 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。Let x = Male, y = Female, z = Child
/ r* b! M3 Y T公仔箱論壇6x + 3y + z/2 = 100 Formula 1
6 o1 ?. J) Q* ^4 K# S6 T9 q6 P* W& J2 oTVBNOW 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 + y + z = 100 Formula 2
& W/ l- p$ ]/ T8 \公仔箱論壇Simplify Formula 2 into z, we get z = 100 - x - y Formula 3公仔箱論壇. `" A! w0 j7 A' n: H- \$ }/ J" w
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4tvb now,tvbnow,bttvb5 s! I( P) p& k
Formula 4 can change into 11x + 5y = 100 Formula 5tvb now,tvbnow,bttvb# h' V% R: Y, t0 R5 p* @% H( k/ x
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。3 R4 \1 N4 h3 ]: x7 U
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.
6 Z' \. ]$ n7 a7 p" ?& O( nEventually, the answer is 20 female and 80 children and no male. |