Question: how to answer a question you don't know?
Answer: Repeat or paraphrase the question out loud. ... , Ask clarifying questions. ... , Admit you don't know the full answer. ... , Provide what information you do have. ... , Promise you will find the answer and come back to the questioner. ... , Ask the questioner how to best reach him, if you don't know how. ... , Ask the group to continue the presentation.