re: Sharing casino winnings with co-worker

Give him 25%. Although the effort is minimal, you did the "work."And unless he directed you to that specific machine, you picked the one that paid, so most likely the free play would have been wasted if he used it. 265 would increase his play 10 fold.

Fwiw, I'd split it right down the middle, mostly because the feeling of doing so and his appreciation would be worth it. The above is just a justification for if you didn't want to. It's thin, though.