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题库 / OG2017Q-DS-268
After winning 50 percent of the first 20 games it played, Team A won all of the remaining games it played. What was the total number of games that Team A won?
(1)Team A played 25 games altogether.
(2) Team A won 60 percent of all the games it played.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析：
（1） A对总共进行了25场比赛，赢得了前20场的50%，也就是赢得了10场比赛，剩下的5场全胜，总共赢了15场比赛，题目得解。
（2） 设A总共赢了x场比赛，A队输了40%的比赛，也就是前20场的50%即10场比赛，(x/0.6)*0.4=10，解得x=15，题目得解。
因此，本题答案为（D），任何一个条件说明均能解题。
通过（1），可以算出剩下打了5场全win，所以一共15；
通过（2），设剩下打了x场，则可以给出（10+x）/(20+x)=0.6，可以算出x=5，所以最后答案为15
所以选D