下面是2014年7月12日的SAT官方每日一题的内容，是关于数学方面的，题型是数学选择。SAT官方每日一题是collegeboard每天都会发布的题目，关于SAT考试的三个部分的各个题型。下面我们就一起来看一下这个SAT官方每日一题吧。

　　At Central High School, the math club has 15 members and the chess club has 12 members. If a total of 13 students belong to only one of the two clubs, how many students belong to both clubs?

　　(A) 2

　　(B) 6

　　(C) 7

　　(D) 12

　　(E) 14

　　The correct answer is C

　　Explanation

　　Let n stand for the number of students who belong to both clubs. The 15 members of the math club can be broken down into two groups: those who are in both clubs (there are n students in this category) and those who are in the math club only (there are 15-n students in this category).

　　The 12 members of the chess club can also be broken down into two groups: n students who are in both clubs and 12-n students who are in the chess club only.

　　Since a total of 13 students belong to only one of the two clubs, you know that (15-n)+(12-n)=13. Solving this equation gives n=7, so 7 students belong to both clubs.

　　以上就是关于2014年7月12日的SAT官方每日一题中数学选择的详细内容，包括了题目和选项以及答案，后面附有一道相关的练习题。大家可以在备考SAT的过程中关注SAT每日一题的内容，这样就可以更好有不间断的练习，也就能在日积月累的过程中得到提高。

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