GMAT Problem Solving

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Source: GWD

Level: 3

The function f is defined for each positive three-digit integer n by , where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that f(m) = 9f(v), then m-v = ?

  • A 8
  • B 9
  • C 18
  • D 20
  • E 80

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