单选题
On a certain French-American committee,
of the members are men, and 
of the men are Americans. If 
of the committee members are French, what fraction of the members are American women?
of the members are men, and of the men are Americans. If of the committee members are French, what fraction of the members are American women?
- 1、
【正确答案】
1、[*]
【答案解析】Use TACTIC 3. The LCM of all the denominators is 120, so assume that the committee has 120 members. Then there are[*] men and 40 women. Of the 80 men 30[*] are American. Since there are 72[*] French members, there are 120 - 72 = 48 Americans, of whom 30 are men, so the other 18 are women. Finally, the fraction of American women is[*]
This is illustrated in the Venn diagram below.
[*]