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【OG20-P146-3題】
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 ?
A.80
B.82
C.85
D.87
E.89
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答案：
D
平均數(shù)為
(72+78+83+R)/4=80
R=87
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