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