[stephen_g]

As an Australian I’d find that strange without a following clarification, in which case the clarifying clause is doing the answering and the first bit is just sentiment. There’s also the possibility of using both yes and no, usually rendered as “Yeah nah” or “Nah yeah” - with the first generally being negative and the second being positive.

So some examples, both being “Yes I’ll do it” -

“Do you mind taking out the rubbish” “Nah, that’s fine” (No actually answers the question and then you confirm)

“Do you mind taking out the rubbish?” “Oh yeah, no problem” (Yes just acting as sentiment)

Or

“Do you mind taking out the rubbish?” “Nah yeah, all good”

Or to say you do mind, you might say “Yeah nah, sorry I’m busy”