2. 外语
  3. If the average (arithmetic mean) of 10, 20, 30, 40, and x is 60, what is the value of x?

If the average (arithmetic mean) of 10, 20, 30, 40, and x is 60, what is the value of x?

admin2012-01-15  30
问题 If the average (arithmetic mean) of 10, 20, 30, 40, and x is 60, what is the value of x?
选项 A、50
B、60
C、100
D、150
E、200
答案E
解析
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