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Question

Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters

Look at this series: 664, 332, 340, 170, ____, 89, ... What number should fill the blank?

Options:
A .  85
B .  97
C .  109
D .  178
Answer: Option D
This is an alternating division and addition series: First, divide by 2, and then add 8.

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