1.one area, 1/3room owned and 2/3 rent.only 2,3,4 bedrooms.the percentage of rent 2 bedrooms to total 2 bedrooms.
1) 2/5 owned rooms are 2 bedrooms
2) 3/5 total rooms are 2 bedrooms
答案:C
2.watch three movies, 30 people watch at least one movie, how many people watch only one movie?
1) 12 people see three movies
2) 20 people see at least two movies.
答案: B