123. Solving a chemistry problem

2. Titanium in steel was determined photometrically by the addition method under the following conditions: sample weight = 0.150 g, solution volume 100 ml. Cuvette I = 1 cm. To 25 ml of the resulting solution was added a reagent 20 ml was added 5 ml of the standard solution amounted to 50 ml. The optical density of the first solution turned out to be 0.33, and the second 0.64. What is the 5th content of titanium in the steel sample?