If 2x + y = 6 and x + 2y = 5, then (x + y)/3 =	Choose one:	A) 1	B) 4 / 3	C) 17 / 5	D) 11 / 9	E) 4

Rationale: we have two equations : 2 x + y = 6 x + 2 y = 5 notice that something nice happens when we add them . we get : 3 x + 3 y = 11 divide both sides by 3 to get : x + y = 11 / 3 so , ( x + y ) / 3 = 11 / 9 answer : d
Answer: D