There is 5% salt in 200 grams of solution. After evaporation, the salt concentration became 25%

There is 5% salt in 200 grams of solution. After evaporation, the salt concentration became 25%. What is the mass of the solution after evaporation?

1) How many grams of a substance is there per 1% in the original solution, if it is known from the condition of the problem that 200 grams of solution is taken?

200: 100 = 2 (g).

2) How many grams of the substance are there in the 5% salt in the original solution?

2 ∙ 5 = 10 (g).

3) How many grams of a substance is there in 1% of the solution after partial evaporation of water, if the salt concentration has become 25%?

10: 25 = 0.4 (g).

4) What is the mass of the solution after evaporation?

0.4 ∙ 100 = 40 (g).

Answer: after evaporation, the mass of the solution began to be 40 grams.