Your guess is as good as mine
Meaning: something you say when you do not know the answer to a question, I have no way of knowing exactly what happened or what will happen
Example: What's he doing? - Your guess is as good as mine. Do you think she'd go out with me if I asked her? - Your guess is as good as mine.
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Example: What's he doing? - Your guess is as good as mine. Do you think she'd go out with me if I asked her? - Your guess is as good as mine.