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In a certain year, the difference between Mary's and Jim's annual salaries was twice the difference between Mary's and Kate's annual salaries. If Mary's annual salary was the highest of the 3 people, what was the average (arithmetic mean) annual salary of the 3 people that year?
(1) Jim's annual salary was $30,000 that year.
(2) Kate's annual salary was $40,000 that year.
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
【答案】Ｂ
【思路】
由題意得知M-J=2(M-K)
M+J=2K 代入==K
(1) 有2個未知
(2) 代入上面簡化的算式得到.
小良冠二郎
错选c。面对这种题目，特别是提醒了你了这是730难度的题，就麻烦你多动手算算。题目虽然无聊透顶，但是得算。
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2023-03-14 23:59:33
626617yh
这些老头净是些奇技淫巧
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2021-03-30 13:07:49
Limor
Kate的工资就是三个人的平均工资
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2020-05-13 19:21:53
Junwei
m-j=2m-2k--->m+j=2k---->m+j+k=4k
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2019-12-04 00:01:25
浪逐曲奇
默认头像突然变难看了。。这道题真的是。。。我再也不偷懒了！勤动手！
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2019-09-27 22:23:28
Joyce L
求平均数要知道的并不是每个数的值，而是它们的合计数，所以不适用多少个未知数需要多少个方程，（就算适用，有些题目的两个条件其实是一个方程，或者每个方程都没有包含数值所以只能求出比例不能求出数值）
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2019-07-28 05:32:46
Kath1230
一定要动手算一算啊。。。
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2019-02-04 14:32:55
yejinsui回复Kath1230
GMAC老头的出题思路真的令人撞墙
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2019-11-15 18:38:17
***8122
求解答 为什么不是C
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2015-07-25 07:09:02
Naomi回复***8122
由题干得之 M+J=2K， 由条件2得之K， 则M+J+K的数值就可以求出，故B足够
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2017-05-09 13:50:02
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数据充分DS
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