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8. What number should replace the question mark?
  iq test. Fast and free online iq test # 4 with answers and solutions. Question # 8. What number should replace the question mark?
 

Explanation:
There are four groups of three numbers : the upper right, upper left, lower right, lower left. Sum of the numbers in each group is 47. (12 + 23 + 12 = 47; 3 + 41 + 3 = 47; 10 + 26 + 11 = 47; 15 + 9 + 23 = 47).