Discussion
Consider the following :
Find the missing number.
Answer: D
The missing number is 15.
The diagonals and midlines cut the square into eight triangles, which pair up along each side of the square: the two triangles touching the same side add up to the same total.
- Left side: 21 + 35 = 56
- Bottom: 14 + 42 = 56
- Right side: 16 + 40 = 56
- Top: 41 + ? = 56
So the missing number is 56 - 41 = 15. The other options give top totals of 53, 54 and 55, which break the pattern.
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