Give stream of consciousness and then the final answer. The average of seven numbers is 9. The average of first three numbers is 7 and the average of last three numbers is 11. What is the middle number?\nOptions:\n(A) 7\n(B) 8\n(C) 9\n(D) 11\n(E) 10
User
The total of seven numbers = 7X9 = 63\nThe total of first 3 and last 3 numbers is = 3 X 7+3 X 11 = 54\nSo, the middle number is (63 - 54 ) = 9
The final answer: (C).
Assistant