111. Solving a chemistry problem

35. A 5.00 ml sample of a mixture of hydrochloric and phosphoric acids was diluted to 200.0 ml. For titration of 20.00 ml of the resulting solution with methyl orange, 18.20 ml of 0.1012 M NaOH were used; when titrating the same sample with phenolphthalein, 34.70 ml of NaOH solution were consumed. What mass of HCl and H3PO4 is contained in 100 ml of the mixture? Answer: 1.26 HCl; 32.73g H3PO4.