A whisky question

Friend of mine went to an interview with an investment bank. As is usual he was asked some brain teaser questions.

Guy goes to a whisky tasting, he notices people never finish the whole glass they always leave dregs in the bottom. For every 10 dreg glasses he can get 1 full glass from the dregs. If there's 100 glasses with dregs how many full glasses can he get?

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hippyjoe1955 · 70-79, M

None. The glasses are empty and have no dregs in them.

JonUK41 · 36-40, M

@hippyjoe1955 Just edited the question to make clear - how many full glasses can he get from 100 glasses with dregs?

My fault for not phrasing it properly