It means "How much."
Cuantas means How many.
how much
How many sisters do you have?
"Cuantas son" in Spanish translates to "how many are there?" or "how many of them." It is often used to ask for a specific quantity or number of things in a conversation.
Compre / compren / compra / comprad unas cuantas cosas.
Cuantas toallas?
How many times a year do you go to the hospital
cuantas oportunidades necesitas
That is Spanish for "How many rooms does it have?"
Translation: Cuantas lenguas hablas?
"Cuantas clases tienes los martes" translates to "How many classes do you have on Tuesdays?"
Cuantas hermanas tiene tu mama?