If a/x = 1/3 and a/y =1/ 4, then (x + y) = Choose one:
A) 2a
B) a/2
C) 6a
D) 7a
E) 9a
Ratio 1:   3a = x   Ratio 2:   4a = y   x+y = 7a   Answer is 7a
<result>D</result>
If a/x = 1/3 and a/y =1/ 4, then (x + y) =