GRE Problem Solving Question 74

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Source: BARRON

If the average (arithmetic mean) of x, y, and z is 20, which of the following is the value of z in terms of x and y?

  • A 20 - x - y
  • B 20 + x + y
  • C 40 - x - y
  • D 40 + x + y
  • E 60 - x - y

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