Data Sufficiency
试题详情
题目：
| Number Studying Biology |
Number Not Studying Biology |
Total | |
| Number of Boys |
18 | ||
| Number of Girls |
|||
| Total | 26 |
The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology. What is the total number of students in the class?
(1) Of the boys in the class, 15 are studying biology.
(2) The number of girls in the class is twice the number of students in the class who are not studying biology.
选项:
答案:
B
提问：
条件1可以知道不学生物的男孩和学生物的女孩，可是不知道不学生物的女孩不行。条件2女孩的数量是不学生物的学生数量的两倍，可是我们不知道总共有多少人不学生物啊 条件2怎么能单独成立呢？我认为两个连立才可以啊15+X=3+X算出不学生物的女孩，然后算出全部
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