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

Explanation:
Sequence: + 3, - 5, + 3, - 5, ... (29 + 3 = 32; 32 - 5 = 27; ...; 25 + 3 = 28; 28 - 5 = 23).