If I ask how many days are there in a week? I get the answer : There are seven days in a week. Here 'seven' is an adjective and not an adverb. Then why are you saying that 'How many' is an interogative adverb? 

"How" is an interrogative adverb which modifies the adjective "many" in the sentence "How many days are there in a week?" It has no link with the answer you get for any question. 

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