Only a genius can solve this question
Answer to question
Divide the shape into three triangles, each triangle is made up of three cells, the sum of the numbers in those three cells is 28. We have:
14 + 5 + 9 = 28.
7 + 6 + 15 = 28.
3 + 15 + 10 = 28.
So the number to fill in is 10.
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