Question

Find the missing number is the following image?

Answer 1

Sum of every row: 7-9-11-13-15-17. Missing 9 and 15 and it is achieved by adding 5 and 2 instead of ? mark as below:
3+2+2=7
2+4+5=11
1+8+8=17
9+2+2=13
5+2+8 =15
2+5+2 = 9