There are a total of 15 numbers with an average of 11. The average of first seven numbers is 14 and the average of last seven numbers is 6. What is the middle number?\nOptions:\n(A) 31\n(B) 24\n(C) 29\n(D) 25\n(E) 21 Stream of consciousness first, then make a decision:
User
The total of 15 numbers = 15X11 = 165\nThe total of first 7 and last 7 numbers is = 7 X 14+7 X 6 = 140\nSo, the middle number is (165 - 140 ) = 25
Thus, the answer is (D).
Assistant