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 ?
"a + b + c + d = 180 a + b = 90 c + d = 90 greatest possible = 89 ( just less than 1 ) answer = d"
subtract(multiply(45, 4), multiply(45, 2))