JEE Advanced 2020 Full Test 5 Paper 1

A 10 mL mixture containing 0.2gNaOH and 0.25gNa2CO3 was treated with xN‌HCl required 15mL of it with phenolphthalein indicator. After end point a 0.5gNaHCO3 was added and it was again titrated with y NHCl required 25.5 mL of HCl with methyl orange. Which of the following is\/are correct?