What was the question for this implicit rationale, and corresponding answer?
5 * 46 – 4 * 45 = 50
 The answer: (D)
The question: The average of five results is 46 and that of the first four is 45. The fifth result is?
Options:
(A) 22
(B) 02
(C) 78
(D) 50
(E) 18