If 2x + y = 7 and x + 2y = 8, then (x + y)/3 = Choose one:	A) 1	B) 4/3	C) 17/5	D) 18/5	E) 5/3
We have two equations:   2x + y = 7   x + 2y = 8   Notice that something nice happens when we ADD them. We get:   3x + 3y = 15   Divide both sides by 3 to get:x + y = 5   So, (x + y)/3 =5/3   Answer: 5/3
<result>E</result>
If 2x + y = 7 and x + 2y = 8, then (x + y)/3 =