There are many pupils in the classroom. Peter was the n th( n is a positive integer) student to arrive. Now I want to ask Peter about what n is. How can I ask him? It seems that it is very difficult to begin with a wh- question in situations like this.

As I have noticed previous similar questions about this.

Where did Peter fall in the sequence of arrival?

Is this idiomatic ?

marked as duplicate by Mari-Lou A, Andrew Leach Sep 12 '15 at 9:16

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