GMAT 考满分题库

Magoosh - 数学PS - 104
The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is added, the average becomes 5a + 20. The fifth number is
  • Aa - 4
  • Ba + 4
  • C4a + 4
  • D4a + 16
  • E9a + 36
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正确答案: E

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