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题库 / GMATLA-DS-55
Of the students in a certain school, 15 percent are enrolled in an art class and 10 percent are enrolled in a music class. What percent of the students in the school are enrolled in neither an art class nor a music class?
(1) 2/3 of the students who are enrolled in an art class are also enrolled in a music class.
(2) There are more than 100 students in the school.
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.
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难道不是加一个条件：学生只有这两门课的选择 逻辑上更合理吗
不然学生也有可能可以选语文课，数学课。。。 要规定全集比较好吧？
没有必要呀。最后题干里的问题不就是问，不选这两门课的学生有多少比重么
啊我知道我错哪了。这个题目给定了选两门课的比例值，我把它和绝对值弄混了（以为不知道总数是多少）它这里其实给了是“1”
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将一个群体划分为各自独立又可以互相交叉的部分，用韦恩图解决。
学生总数T： A=15%T ； M=10%T ； R为什么课都没选的
条件1： 选了A又选T的是 2/3A 所以选R=T-A-M-2/3A 代入就行了