Grade 12 Chemistry Studying Please answer quickly, neatly and clearly. Thank you

You are performing a titration with a 0.5MNaOH solution, into a HCl solution of unknown concentration. If the HCl sample is 300mL, and it is neutralized by 250mL of NaOH; a) what was the original concentration of the HCl solution? b) what was the pH at the point of the titration when 125mL of NaOH was added