Knowing the pronoun toks, we can learn the question word for it:

koks (like what?, masculine)
kokia (like what?, feminine)
kokie (like what?, plural masculine)
kokios (like what?, plural feminine)

The endings of this pronoun are exactly like toks:

Koks čia autobusas? What bus is this?
Kokia tavo pavardė? What is your surname?
Kokie vyrai jums patinka? What men do you like?
Kokių moterų jums reikia? What women do you need?
Koks tavo numeris? What is your number?

Koks tėvas, toks ir sūnus. Like father, like son.
Kokie mokytojai, tokie ir mokiniai. Like teachers, like pupils.
Koks vardas, tokia pavardė. The name is the same as the surname.

Koks gražus berniukas! What a beautiful boy!
Kokios greitos mašinos! What fast cars!
Kokia žalia žolė! What green grass! Such green grass!