Which number should replace the question mark?
    8 5 21
    35 32 12
    32 28 31
    4 ? 28

  • A. 3
  • B. -2
  • C. -6
  • D. 48
  • Explanation:

    For each row subtract the second column from the first column. The result is equal to the sum of the digits in the last column

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Which number should replace the question mark? 8 5 21 35 32 12 32 28 31
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