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The average(arithmetic mean)of c and d is 12, and the average of c, d, and e is
The average(arithmetic mean)of c and d is 12, and the average of c, d, and e is
游客
2025-02-24
29
管理
问题
The average(arithmetic mean)of c and d is 12, and the average of c, d, and e is What is the value of e?
选项
A、6
B、10
C、12
D、18
E、20
答案
A
解析
The correct answer is A. First, set up equations to represent the given averages:
Next, simplify the first equation: c+d=24
Now, substitute this value into the second equation and solve for e:
24 + e = 30
e = 6
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