The average of 13 numbers is 60. Average of the first 7 of them is 55 and that of the last 7 is 61. Find the 8th number?\nOptions:\n(A) 32\n(B) 83\n(C) 45\n(D) 53\n(E) 64 Let's think first. Stream of consciousness:
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Sum of all the 13 numbers = 13 * 60 = 780\nSum of the first 7 of them = 7 * 55 = 385\nSum of the last 7 of them = 7 * 61 = 427\nSo, the 8th number = 427 + 385 - 780 = 32.
So, the answer is (A).
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