stupid math problem

Here's this stupid logic deal. I need to find the formula, but it's probably something stupid that will take forever to find. Here's the codes, the actual word problem doesn't mean jack shit.

Column A          Column B
--------          --------
623               487
509               501
1407              9623
?                 365

Two internets to anyone who can solve this.

I think you fucked up the 3rd row, and I think the answer is 745.  Basically, each digit in each number in column A is subtracted from 10 to get the number is column B.

ah, I guess so. must've copied it wrong. thanks.

>>3
No you are inobservant.