GMAT数学题When positive integer x is divided by 5,the remainder

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GMAT数学题
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 -
A.12
B.15
C.20
D.28
E.35

作差的话消去了余数,因为他们的余数是一样的,所以作差后的数是5的倍数也是7的倍数,只能是e了

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