# To 500 g of a 22% solution of the substance, 300 g of a 30% solution

**To 500 g of a 22% solution of the substance, 300 g of a 30% solution of this substance was added, what is the concentration of the resulting mixture.**

First, we determine the weight of the substance in each solution.

To do this, we multiply the known masses by the percentage of the substance.

Will be:

500 * 22% = 500 * 0.22 = 110 grams of substance (in the first solution).

300 * 30% = 300 * 0.3 = 90 grams of the substance (in the second solution).

We find the total mass of the two solutions.

500 + 300 = 800 grams.

We find the total weight of the substance in two solutions.

110 + 90 = 200 grams.

We find the percentage of the substance.

To do this, divide the mass of the substance by the mass of the solution and multiply by 100%.

Will be:

200/800 * 100% = 25%.

Answer: 25%.