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  3. In a history class that consisted of 30 students, the number of seniors was 3 more than twice the number of juniors, and 3/10 of

In a history class that consisted of 30 students, the number of seniors was 3 more than twice the number of juniors, and 3/10 of

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问题 In a history class that consisted of 30 students, the number of seniors was 3 more than twice the number of juniors, and 3/10 of the students were neither juniors nor seniors.

Column A                                   Column B
The number of juniors in the class         6
选项 A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案C
解析 一历史班由30名学生组成，高年级学生人数等于低年级学生人数的二倍加3，且有3/10的人既不是低年级学生也不是高年级学生。
解：本题的正确答案为(C)。设该班中低年级学生人数为x，由题意可得到下面的方程：x+(2x+3)+ 3/10 ×30=30 → x=6
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