If x and y are positive integers, each of the following could be the greatest common divisor of 30x and 15y EXCEPT
Choose the most appropriate option.
A) 30x. B) 15y. C) 15(x + y). D) 15(x - y). E) 15,000.
If x=1 and y=1, then 30 x=30 and 15y=15. The GCD of 30 and 15 is 15, while (C) gives 15(x+y)=30.   ANSWER:15(x + y).
<result>C</result>
If x and y are positive integers, each of the following could be the greatest common divisor of 30x and 15y EXCEPT