If x and y are integers and xy = 660, x or y must be divisible by which of the following numbers?  Choose the correct choice from the following answers:
A) 4
B) 5
C) 6
D) 20
E) 30
xy = 660 = 2 * 2 * 3 * 5 * 11   One of x or y must be divisible by 5.   The answer is 5.
<result>B</result>
If x and y are integers and xy = 660, x or y must be divisible by which of the following numbers?