This is the 6825th most frequent Turkish word.
birçoğu
"Birçoğu" means "many of them" or "most of them" in English.
In this sentence, 'birçoğu' is used to indicate a significant portion or majority of a specific group, i.e., books.
Kitapların birçoğu kütüphanede bulunabilir.
Many of the books can be found in the library.
In this context, 'birçoğu' refers to a substantial number of individuals from a defined group, i.e., children.
Çocukların birçoğu parka gitmek istiyor.
Many of the children want to go to the park.
Here, 'birçoğu' signifies a majority of the specified items, i.e., problems, emphasizing they were addressed.