If (A+B) = 4, (B+C) = 7 and (C+D) = 5, what is the value of (A+D)? Choices:
A) 16 .
B) 8 .
C) 7 .
D) 2 .
E) - 2 .

Rationale: "given a + b = 4 b + c = 7 c + d = 5 ( a + b ) - ( b + c ) + ( c + d ) = ( a + d ) = > 4 - 7 + 5 = 2 . option d . . ."
Answer: D