Are at least 10 percent of the people in Country X who are 65 years old or
older employed?
(1) In Country X, 11.3 percent of the population is 65 years old or older.
(2) In Country X, of the population 65 years old or older, 20 percent of the
men and 10 percent of the women are employed.
【答案】B
【思路】假設65歲(含)以上男生數為x,女生數為y,.....
我的問題是 為什麼不能用以下方法:
>65 ~ >65
employed a b
求a+b+c>10%?
~employed c d
(a) a+c=11.3%, a+b+c>10% 成立
我.想.好.久.阿~~~
不知道為什麼原解法要這樣假設?
謝謝~
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