Q14:
If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30, what is the average of x and y?
A. 40
B. 45
C. 60
D. 75
E. 95
Answer: E
我计算出来的结果是-25,但如果题目中Greater than改为less than答案就正确啦
以下是引用sammen在2005-1-3 21:21:00的发言: (x+y+20)/3=(x+y+20+30)/4+10
呵呵,谢谢
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