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11. What two numbers should replace the question marks?
  64 57 61 54 58 ? ?
 

Explanation:
Sequence: - 7, + 4, - 7, + 4, ... (64 - 7 = 57; 57 + 4 = 61; ...; 58 - 7 = 51; 51 + 4 = 55).