※ 引述《iiia (ii)》之銘言：
: 1.If the ratio of men to women employed by Company S in 1975 was 1/2,
: What is the ratio of men to women employed by Company S in 1976?
: (1) Company S employed 20 more women in 1976 than in 1975.
: (2)Company S employed 20 more men in 1976 than in 1975.
: 我知道這兩格條件單獨分開是都不行的..
: 但結合在一起不是可以設X Y 求出XY 然後知道1976年的比率
: 但答案是~~E
不懂你的意思...原本的樣本數沒給妳 只知道增加多少人(多少男 多少女...)
如何知道比率@@"??
1975 40 : 80
=> 1976 60 : 100 => 3:5
1975 90 : 180
=> 1976 110 : 200 => 55 : 100
也沒條件讓你列式呢....
: 2.Exactly how many bonds dose Bob have?
: (1)Of Bob's bonds , exactly 21 are worth at least $5.000 each
: (2)Of Bob's bonds , exactly 65 percent are worth less than $5.000 each.
: 第一條件我看不太懂說....
: 答案C
問有多少bonds?
五元以上有21張
未滿五元的有65% 可以知道五元以上有35%
35%=21張
就可以知道全部有幾張了....
所以C...
其他看上一篇吧
※ 編輯: giyoshi 來自: 123.192.191.99 (02/13 01:54)