3x + y = 21 , and x + 3y = 1. Find the value of 2x + 2y  Choose the correct choice from the following answers.
A) 20	B) 18	C) 16	D) 11	E) 5

Rationale: "add these two equations 4 x + 4 y = 22 divide by 2 ( to get 2 x + 2 y ) answer will be d . 11"
Answer: D