520 g of solution, the ratio of the mass of water to the mass of salt is 17: 3. Calculating the mass

520 g of solution, the ratio of the mass of water to the mass of salt is 17: 3. Calculating the mass of salt in the solution, find the concentration of the solution?

In total, the solution contains parts of water and salt:
17 + 3 = 20 (parts).
We find the mass of one part:
520/20 = 26 (gr).
We find the mass of salt in the solution, knowing that it accounts for 3 parts:
3 * 26 = 78 (gr).
Let’s make the proportion and find the salt concentration in the solution:
520 g = 100%
78 g = x%
x = 78 * 100/520 = 15%
Answer: the mass of salt in solution is 78 g, the concentration is 15%.