The average (arithmetic mean) of 4 positive integers is 45. If the average of 2 of these integers is 45, what is the greatest possible value that one of the other 2 integers can have?
Options:  A) 55  B) 65  C) 100  D) 89  E) 115

Rationale: "a + b + c + d = 180 a + b = 90 c + d = 90 greatest possible = 89 ( just less than 1 ) answer = d"
Answer: D