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

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

Asked 1 year ago
ChrisC1Correct answer
Hi Mary,

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

-- Chris (not a native speaker).
So then why not say "J'ai bu une tierce de la bouteille"? 
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?

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

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