Why would you say, J’ai bu un tiers de la bouteille, when bouteille is feminine?

Mary M.A1Kwiziq community member

Why would you say, J’ai bu un tiers de la bouteille, when bouteille is feminine?

Asked 6 years ago
Chris W.C1 Kwiziq Q&A super contributor Correct answer
Hi Mary,

Yes, "la bouteille" is feminine but "un tiers" is masculine. So "un tiers de la bouteille".

-- Chris (not a native speaker).
steven l.B1Kwiziq Q&A regular contributor
So then why not say "J'ai bu une tierce de la bouteille"? 
Michelle P.C1Kwiziq Q&A regular contributor
But tierce is used in the other example to agree with the feminine personne. So, like Steven, I'm not understanding the reasoning here. Doesn't tiers/tierce, agree with the noun like premier/première and second/seconde do?
Mary M. asked:

Why would you say, J’ai bu un tiers de la bouteille, when bouteille is feminine?

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