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28. What figure should replace the question mark?
  IQ test. Accurate and free online iq test # 3 with answers and solutions. Question # 28. What figure should replace the question mark?
 

Explanation:
The first numbers: 10, 14. Next number = (current number + previous number) - (current number - previous number) - 1 (further 2, 3, 4, 5, 6). (14 + 10) - (14 - 10) - 1 = 19; (19 + 14) - (19 - 14) - 2 = 26; ...; (65 + 48) - (65 - 48) - 6 = 90.