If 2x + y = 4 and x + 2y = 5, then (x + y)/3 =	Choose the correct choice from the following answers:
A) 1
B) 4 / 3
C) 17 / 5
D) 18 / 5
E) 4

Rationale: "we have two equations : 2 x + y = 4 x + 2 y = 5 notice that something nice happens when we add them . we get : 3 x + 3 y = 9 divide both sides by 3 to get : x + y = 3 so , ( x + y ) / 3 = 3 / 3 = 1 answer : a"
Answer: A