Give stream of consciousness and then the final answer. Look at this series: 80, 10, 70, 15, 60, ... What number should come next?\nOptions:\n(A) 20\n(B) 23\n(C) 25\n(D) 30\n(E) 35
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This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.
The final answer: (A).
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