If (A+B) = 4, (B+C) = 9 and (C+D) = 3, what is the value of (A+D)?
Choose the correct choice: A) 16 . B) 8 . C) 7 D) 2 . E) - 2

Rationale: "given a + b = 4 = > a = 4 - b - - > eq 1 b + c = 9 c + d = 3 = > d = 3 - c - - > eq 2 then eqs 1 + 2 = > a + d = 4 - b + 3 - c = > 7 - ( b + c ) = > 7 - 9 = - 2 . option e . . ."
Answer: E