Answer:
He purchased 3 baked bries for the party.
Step-by-step explanation:
Let Abdoulaye buy x number of baked bries for the party.
Now. Abdoulaye invited 27 people to his new year's party all of his guests ate [tex]\frac{1}{4}[/tex] of baked brie.
Therefore, he has [tex](x - \frac{x}{4}) = \frac{3x}{4}[/tex] number of baked bries after party.
Given that, [tex]\frac{3x}{4} = \frac{9}{4}[/tex]
⇒ x = 3.
Hence, he purchased 3 baked bries for the party. (Answer)