GMAT Problem Solving
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Source: GWD
Level: 0
When positive integer x is divided by 5, the remainder is 3; and when x is divided by 7, the remainder is 4. When positive integer y is divided by 5, the remainder is 3; and when y is divided by 7, the remainder is 4. If x＞y, which of the following must be a factor of x - y?
- A 12
- B 15
- C 20
- D 28
- E 35