flagging posts answered/unanswered?

[420]

i would like to flag certain posts that remain unanswered, is there a way to do this?

example.

i have a staff of 25 mods, all of which answer questions from our members...
i would like to mark certain posts answered once they have been answered, so when the team comes in, they can go straight to thee unanswered questions, instead of having to sift through every single post that is flagged unread by them...

so i want to add a second form of flagging posts, flagging them answered when answered and flagging them unanswered should be automatic once posted... is this possible without an add on or is there an add on already developed for this?

thanks for your valuable time and energy.