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How should I phrase a question that must be answered with an ordinal number (e.g., the third prime)?
Framing a question to which the answer is an ordinal number
How to ask a question to get a cardinal number answer

Assume that there are 5 apples must be eaten by Jack. When you want to know about how many of the apples are eaten, you may ask Jack, 'how many apples have you eaten?'; But how can I ask the question to make Jack answers, 'I'm eating the fourth apple'?


The social and linguistic context would usually make clear what was meant if you asked Jack 'Which one are you on now?'

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