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【OG20-P146-3题】
During a trip that they took together ,Carmen ,Juan ,Maria ,and Rafael drove an average (arithmetic mean )of 80 miles each. Carmen drove 72 miles ,Juan drove 78 miles ,and Maria drove 83 miles .How may miles did Rafael drive ?
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该题平均耗时:56.83s ,平均正确率:97%。
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当前版本由
Helen 更新于2018-09-06 14:36:55 感谢由
Helen 对此题目的解答所做出的贡献。
平均数为80
(72+78+83+R)/4=80
R=87
题目讨论 (3条评论)

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GYCcccc
8+2-3=7 尾数是7 87
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0 回复 2021-02-03 22:10:48
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192644chvth
冲
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0 回复 2019-09-01 14:30:21
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四个自信
$
0
0 回复 2018-10-19 03:18:13