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5. What figure should replace the question mark?
  IQ test. Accurate and free online iq test # 3 with answers and solutions. Question # 5. What figure should replace the question mark?
 

Explanation:
The numbers outside the circle are added together. The numbers inside the circle are subtracted. The total amount is inside the triangle. (21 + 15 + 7 - 18 - 7 - 14 = 4; 29 + 4 + 17 - 24 - 7 - 16 = 3; 24 + 32 + 27 - 35 - 28 - 12 = 8).