To 250 grams of a 20% solution was added 120 grams of a 10% solution

To 250 grams of a 20% solution was added 120 grams of a 10% solution. Find the mass of the resulting solution, the mass of salt in the resulting solution.

Given:

m (first solution) = 250 g

m (second solution) = 120 g

w% (salts in the first solution) = 20%

w% (salts in the second solution) = 10%

To find:

m (final solution) -?

m (salt) -?

Decision:

1) Find the mass of the solution after draining:

m (solution) = 250 g + 120 g = 370 g;

2) Find the mass of salt in both solutions:

m (salts in the first solution) = 250 g * 0.2 = 50 g;

m (salts in the second solution) = 120 g * 0.1 = 12 g;

3) Find the mass of salt after draining the solutions:

m (salt) = 50 g + 12 g = 62 g;

Answer: m (salt) = 62 g; m (solution) = 370 g.