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In a history class that consisted of 30 students, the number of seniors was 3 mo
In a history class that consisted of 30 students, the number of seniors was 3 mo
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2024-01-12
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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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