Hol van a borotvátok? (singular razor, plural you)
Hol vannak a borotváitok? (plular razor, plural you)
there could also be
Hol van a borotvád? (singular razor, singular you)
Hol vannak a borotváid? (plular razor, singular you)
But, this sentence Hol van a borotvátok? can be translated as where are your razors in English, if we mean that you have one razor each.