In each column, the top and bottom numbers add up to the middle number. Which number replaces the question marks?
09, 12, 03
23, 24, 34
14, 12, ??

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• A 31
• B 24
• C 43
• D 17

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Answer: A. 31

In each column, top number + bottom number = middle number: 9 + 14 = 23, 12 + 12 = 24, so 3 + ? = 34 gives ? = 31.

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