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单选题
The average (arithmetic mean) of c and d is 12, and the average of c, d, and e is 10. What is the value of e?
A
6
B
10
C
12
D
18
E
20
参考答案
参考解析
解析：
根据题目中已知的数量关系，可列等式如下：c+d= 12×2=24……①；c+d+e=10×3=30……②。把等式①代入等式②得，24+e=30，e=6。
根据题目中已知的数量关系，可列等式如下：c+d= 12×2=24……①；c+d+e=10×3=30……②。把等式①代入等式②得，24+e=30，e=6。
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