That is a very simple mathematics question.公仔箱論壇" K* L- d. R3 _" V7 F- f
Let x = Male, y = Female, z = Child公仔箱論壇( l) |$ a% Z; d- V
6x + 3y + z/2 = 100 Formula 1os.tvboxnow.com+ z9 L# g9 F( m" G. P9 V1 G N
x + y + z = 100 Formula 2公仔箱論壇8 `1 O* C, @, o6 r6 ?& _
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3os.tvboxnow.com! r5 B( s: e n: d0 t/ K
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4tvb now,tvbnow,bttvb4 `- ~3 x) f+ p' u, e, x
Formula 4 can change into 11x + 5y = 100 Formula 5
3 V$ C4 R' d4 j: u aTVBNOW 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- t! i0 s; R% |7 `/ R7 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.
: [+ N. Y3 k4 o4 F" K D4 pos.tvboxnow.comEventually, the answer is 20 female and 80 children and no male. |