Some question: The average of thirteen numbers is 9. The average of first six numbers is 5 and the average of last six numbers is 7. What is the middle number?\nOptions:\n(A) 47\n(B) 45\n(C) 25\n(D) 37\n(E) 44
Some stream of consciousness:
User
The total of thirteen numbers = 13X9 = 117\nThe total of first 6 and last 6 numbers is = 6 X 5+6 X 7 = 72\nSo, the middle number is (117 - 72 ) = 45 The answer: (B).
Assistant