What does Capulet then tell Paris?Capulet changes his mind about Paris' question.
This depends where you are in the play.
At first, in Act I, scene ii, Paris asks Capulet
What say you then to my suit?
We later can tell this suit had to do with Paris wanting to marry Juliet.
Capulet is game as long as Paris woos her and comes to the Capulets great feast to be held that evening comparing her to the other girls. Capulet is being a caring dad at this point wanting love for his daughter instead of just arranging her marriage for her.
Later in the story, Act III, scene iv, after a relative of the Capulet family has been killed, Capulet arranges the marriage without Juliet's consent to stop her 'grief' over the dead relative. Capulet has no idea Juliet has secretly married Romeo at this point.
This depends some on where in the play you are talking about. When you ask questions on here, you'll get better answers if you are more specific with your question. We don't know what came before...
But my guess is that you are talking about the part in Act I where Paris is asking Capulet to let him marry Juliet. In that part (Scene 2) Capulet has two different answers. First he says that Juliet is too young to get married. But then Paris persists. Capulet then responds by changing his mind a bit. He says that it will be okay with him as long as Paris can persuade Juliet to agree. So he gives two answers there and the second one might be what you're asking about.