GRE Problem Solving Question 551

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Source: Magoosh

The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is added, the average becomes 5*a + 20. The fifth number is

  • A a-4
  • B a+4
  • C 4*a+4
  • D 4*a+16
  • E 9*a+36

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