There is only one interrogative pronoun for quantity—колко—and it doesn't have any gender or number forms. It is used before plural nouns to ask about their quantity (then it is translated as how much/how many), and before an adjective or adverb to ask about the extent, degree, age, etc.
The interrogative pronoun kolko is the sole quantity pronoun; it doesn't vary by gender or number. It's utilized before plural nouns to question their amount (translated as how much/how many), and before adjectives or adverbs for inquiries about extent, degree, age, etc.