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For each row, the third column involved calculating the sum of the digits.
I answered zero, because if you subtract the two digits that are in the same box, you'll get:
8, 5, 1
-2, 1, -1
4, ? , -6
Then if you add the rows you get: 13 (8+5+1), -2 and -6. I you add them up, it becomes zero, so the whole thing to keep the answer as zero, the ? should be zero. Possible solution, but wrong here.
First row: 8,5,21= 21 (2+1)=3. 8-3=5
Second row 35,32,12= 12 (1+2)=3. 35-3=32
Third row 32,29,21= 21(2+1)=3. 32-3=29
Fourth row 4,?,28=28 (2+8)=10. 4-10=-6 (the answer)
i only guessed it right and do not no why -6 is the answer
For each row subtract the second column from the first column. The result is equal to the sum of the digits in the last column.
This is the simple explanation
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