The average(arithmetic mean)of c and d is 12, and the average of c, d, and e is

游客2025-02-24 25

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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Theaverage(arithmeticmean)ofcanddis12,andtheaverageofc,d,andeis