58. Solving a chemistry problem

65. How many mg of a substance containing 60% NaCl and 37% KCl should be taken for analysis so that after adding 25 ml of 0.100 N. AgNO3 solution, its excess was titrated with 5 ml of NH4SCN solution (1 ml of NH4SCN solution is equivalent to 1.10 ml of AgNO3 solution).