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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ninalanyon · 61-69, T

That's the first trick question I can recall seeing that is actually relevant to the job being applied for.

Oops forgot to answer. It's eleven.

ninalanyon · 61-69, T

@ninalanyon It occurs to me that a further comment is called for. I see trick interview questions being mentioned online quite often. But in my career I never encountered one in real life, nor can I recall any of my friends, relatives, or acquaintances ever saying that they had encountered one.

So are they simply mythical or do they actually happen but not where I have looked for jobs (UK, Norway)?