Daze Puzzle provides a complete walkthrough for "Brain Test Level 278: What is the question mark?".
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Question
What is the question mark?
Hint 1
8 + 3 + 1 = 12
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Answer
All the numbers in the triangles are the sum of its corners. As an example, 8+3+1 equals 12. Therefore, 4+5+10 would be 19. The answer is 19.
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