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4. What two numbers should replace the question marks?
  25 30 27 32 29 ? ?
 

Explanation:
Sequence: + 5, - 3, + 5, - 3, ... (25 + 5 = 30; 30 - 3 = 27; ...; 29 + 5 = 34; 34 - 3 = 31).