题目信息
In a certain calculus class, the ratio of the number of mathematics majors to the number of students who are not mathematics majors is 2 to 5.if 2 more mathematics majors were to enter the class the ratio would be 1 to 2. How many students are in the class
A:10
B:12
C:21
D:28
E:35
参考答案及共享解析
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正确答案：
D:28
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