That is a very simple mathematics question.
+ X% i) |( {' W7 V公仔箱論壇Let x = Male, y = Female, z = Child
" B9 U( e: K! [, e4 F公仔箱論壇6x + 3y + z/2 = 100 Formula 1
0 n3 ?1 x! X; Qx + y + z = 100 Formula 2
/ D1 l* q9 l" `2 I7 ISimplify Formula 2 into z, we get z = 100 - x - y Formula 3tvb now,tvbnow,bttvb- Q: O! [2 |2 d+ T2 A- d
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4tvb now,tvbnow,bttvb% U2 u& T- A$ s$ |" |8 F! V! G9 p, f
Formula 4 can change into 11x + 5y = 100 Formula 5
4 ], _4 U$ w! Y2 }1 h7 htvb now,tvbnow,bttvbIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.
+ _, D8 d5 \8 I' B9 r8 tAnd 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 u$ @5 Y7 J: V) O8 TTVBNOW 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。Eventually, the answer is 20 female and 80 children and no male. |