You might get a couple of different answers for the following:
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$\begingroup$ I would have liked the question better if O was more ambiguous, but I like this answer regardless. $\endgroup$ Commented Jan 10 at 17:44
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When this question is read out loud, ten is mentioned 6 times. 5 of them individually except for ten in senTENce. If you are doing it by looking at the piece of text, it is 7(the billion). Otherwise, if you are counting the number 10(as a number not in other words) its 5.