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Magoosh - 数学PS - 130
The average (arithmetic mean) of five numbers is 3x + 4. If one of the numbers is 7x - 4, what is the average of the other four numbers?
  • A1.6x + 3.2
  • B1.6x + 4.8
  • C2x + 4
  • D2x + 6
  • E4x + 8
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正确答案: D

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