I spent an hour attempting to solve this but couldn't find any particular pattern in which the numbers are arranged. I asked my teachers but none of them could solve it.
The answer is
8
Can anyone explain it?
First row + Third row = Second row + Fourth row
6849 + 4675 = 8659 + 2865
5777 + 5658 = 9299 + 2136
4271 + 6005 = 4595 + 5681
3284 + ?052 = 4492 + 6844