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26. What number should replace the question mark?
  IQ test. Accurate and free online iq test # 3 with answers and solutions. Question # 26. What number should replace the question mark?
 

Explanation:
Sequence: (8 + 3) - (7 + 5) ÷ 2 = 5; (9 + 7) - (4 + 8) ÷ 2 = 10; (11 + 2) - (12 + 6) ÷ 2 = 4.