Could you please help in this question?

The final answer in the marking scheme 3.84 mol dm^-3 ammonia concentration. I am not sure how to get to this answer

The titration above can be used to determine the concentration of ammonia solution when ammonia is distributed between the two immiscible solvents, trichloromethane and water. An experiment is carried out to find the equilibrium constant for the reaction: NH, (CHI) = NH, (aq) 75 cm' of 4.0 mol dm aqueous ammonia solution and 75 cm of the trichloromethane are shaken together. The two liquids are allowed to separate and 25.0 cm'of the aqueous layer is taken and titrated with 4.0 mol dm hydrochloric acid. The whole procedure is repeated. The average titre is 24.0 cm! (1) Calculate the number of moles of ammonia, and hence the concentration of ammonia, in mol dm in the aqueous layer