OG data sufficiency 第49题、83题、85题疑难

kuuiytt

Data sufficiency 疑难

49、Of the 230 single—family homes built in City X last year，how many were occupied at the end of the year？

（1）Of all single—family homes in City X，90 percent were occupied at the end of last year

（2）A total of 7200 single—family homes in City X were occupied at the end of last year。

答案是E，即这两个条件都不能满足问题的需要。我不明白。也许是题意不理解吧

83、The participants in a race consisted of 3 teams with 3 runners on each team。A team was awarded 6 － n points if one of its runners finished in nth place，where 1≤n≤5，If all the runners finished the race and if there were no ties，was each team awarded at least one point？

（1）No team was awarded more than a total of 6 points

（2）No pair of teammates finished in consecutive places among the top five places

本题的答案是A，即，有第一个条件就足够解决这个题了。我不理解题意造成我读不懂，

86、How many integers n are there such that r <n<s?

（1）s－r=5 （2）r and s are not integers

本题答案是C，即，两个条件合在一起才能解此题。我不明白

himba

49问的是去年建的single-family homes占用率是多少，两个条件都不能满足。

83，有三只参赛队伍，每队有3人组成。如果参赛者以第n名结束，那么这个队就得6 -n 分，1≤n≤5。没有平局，每一个队伍至少得一分吗？

1.没有一个队伍总分超过6分

2.前五名中没有同一个队伍获得相邻的名次。

86、How many integers n are there such that r <n<s?

（1）s－r=5 （2）r and s are not integers

如果s, r 为整数， 比如，1和6，那么n的个数为4；如果为分数，1.1和6.1，n的个数为5。所以c.