3. Solving a chemistry problem

164. A sample of steel with mass m (g) was dissolved in a flask with a capacity of 50.0 ml. Aliquots of 20.0 ml each were taken into two 50.0 ml volumetric flasks. A solution containing 0.001000 g of titanium was added to one flask. Hydrogen peroxide was poured into both flasks and the solutions were brought to the mark. Calculate the mass fraction (%) of titanium in steel if the following optical densities Ax and Ax + st were obtained during photometry of solutions:
Option 164
m, g 0.4600
Ah 0.200
Ax+st 0.420