Question: how to answer when someone says would you mind?
Answer: The answer may be "Of course not!" which means "I don't/wouldn't mind if you do it", or "Of course I do (mind)!" which means the reverse. Also, to agree, you may answer "Go ahead!" or "Please, do!" or to disagree, "Please, don't!" (Then it would be polite to explain the reason for your disagreement) .