The bartender asks if everyone wants a drink, but one person can't speak for the other two, so he says "I don't know". Same for the second. If either of the first two hadn't wanted one, they could have responded "No, not everyone wants a drink", but they didn't, indicating that they did but they weren't sure about the others. The third, having heard their responses signifying that they did, in fact, want a drink, was able to answer that yes, everyone wants a drink.
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