The average of nine numbers is 15. The average of first four numbers is 11 and the average of last four numbers is 14. What is the middle number?\nOptions:\n(A) 19\n(B) 20\n(C) 35\n(D) 31\n(E) 27 OK. Let's think. Some random thoughts first:
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The total of nine numbers = 9X15 = 135\nThe total of first 4 and last 4 numbers is = 4 X 11+4 X 14 = 100\nSo, the middle number is (135 - 100 ) = 35 The answer: (C).
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