The average of five numbers is 9. The average of first two numbers is 7 and the average of last two numbers is 12. What is the middle number?\nOptions:\n(A) 7\n(B) 8\n(C) 5\n(D) 10\n(E) 6 Stream of consciousness:
User
The total of five numbers = 5x9 = 45\nThe total of first 2 and last 2 numbers is = 2 X 7+2 X 12 = 38\nSo, the middle number is (45 - 38 ) = 7
Thus, the answer is (A).
Assistant