Situation is this: X and Y sit near my cubicle. X asks Y some question, which Y doesn't know an answer to, but together they spend quite some time talking on that.
I have heard their conversation, and I think I know the answer. Should I interrupt their conversation and tell them what I think? But this might look little weird as X didn't ask me for help. Again, it would also mean that I am not concentrating on my own work and listening to others' conversation. What should I do?
If I decide to help them, what are the different ways to say it?
Note: This question is slightly different than Should I help co-workers with their projects? in the sense that the situation here is somewhat different.