How much, it is necessary to take potassium chloride salts to obtain 300 g of a solution

How much, it is necessary to take potassium chloride salts to obtain 300 g of a solution with a mass fraction of 5%. How much salt and water should be taken.

Determine the masses of potassium chloride and water that need to be taken to prepare 300 g of a 5% salt solution.
m (KCl) = W (KCl) • m (solution) / 100% = 5% • 300 g / 100% = 15 g.
m (H2O) = m (solution) – m (KCl) = 300 – 15 = 285 g.
So you need to take 15 g of salt and dissolve in 285 g of water.