$a$ is a positive integer and $$\operatorname { LCM } ( 5 , a ) = \operatorname { GCD } ( 20 , a )$$ Given this, what is the sum of the values that $a$ can take? A) 25 B) 30 C) 35 D) 40 E) 45
$a$ is a positive integer and
$$\operatorname { LCM } ( 5 , a ) = \operatorname { GCD } ( 20 , a )$$
Given this, what is the sum of the values that $a$ can take?\\
A) 25\\
B) 30\\
C) 35\\
D) 40\\
E) 45