Hoş bulduk or Hoş buldum
Hello! May I ask you a question? There is a dialogue in my textbook: Melih Merhaba, anne Anne Merhaba, oğlum. Hoş geldin! Melih Hoş bulduk, anneciğim I wonder, why does he say "Hoş bulduk" but not "Hoş buldum"?

Question

Hoş bulduk or Hoş buldum
Hello! May I ask you a question? There is a dialogue in my textbook:          Melih  Merhaba, anne                                                                              Anne   Merhaba, oğlum. Hoş geldin!                                                          Melih  Hoş bulduk, anneciğim                                                                      I wonder, why does he say "Hoş bulduk" but not "Hoş buldum"?

Answer

It's how we generally use it. I don't know why. Regardless of how many people there are, it's used in plural form. But it's not wrong to say "hoş buldum" when there is only one person. In this dialogue Melih could also say "hoş buldum"

Answer

that is used in plural use. hosbulduk is true

Answer

Plural form gives kindness and modestness. it is something pleasant to avoid pointing out urself  in our culture.