To 200 g of a 25% salt solution poured 300 g of a 20% solution of the same salt, determine

To 200 g of a 25% salt solution poured 300 g of a 20% solution of the same salt, determine the concentration of this solution.

To solve this problem, you need to calculate the mass of the solute in each of the solutions. Then find the mass of the entire solution after draining. Then find the mass of the solute in the resulting solution. And finally, calculate the mass fraction of the substance in the resulting solution.
Working formula: W = (mr.v – wa / mr – pa) * 100%.
Decision:
1) 200 * 25/100 = 50g.
2) 300 * 20/100 = 60g.
3) 200 + 300 = 500g.
4) 50 + 60 = 110g.
5) 110/500 * 100 = 22% – the answer.