For this week's own,
I think the answer is 16 from my own logic.
Using the Rows of the box:
17+24+6= 47
25+10+8=43
Then for the last row,
12+11+X=39
Which is, 23+X=39
Hence, X=16
What we see here is the sum of the rows been odd numbers and then a subtraction of 4 from the answer you got on the first rows to get the answer on the second row.
47-4= 43
Hence,
43-4=39
We then find the missing number from there