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28. What number should replace the question mark?
  iq test. Free iq test online # 1 with answers and solutions. Question # 28. What number should replace the question mark?
 

Explanation:
First, there are two numbers: 8, 12. Next comes a sequence: (12 + 8) - (12 - 8) + 1 = 17; (17 + 12) - (17 - 12) + 2 = 26; ...; (79 + 56) - (79 - 56) + 6 = 118.