How many grams of copper sulfate and how many grams of water do you need to take to prepare 250

How many grams of copper sulfate and how many grams of water do you need to take to prepare 250 grams of a 25% solution of it?

The mass of the solution is 250 grams;
To find the mass of salt, it is necessary to multiply its mass fraction by the mass of the solution.
m salt = 250 x 0.05 = 12.5 grams;
To find the mass of water, subtract the mass of salt from the mass of the solution:
m of water = 250 – 12.5 = 237.5 grams;
The density of water is 1 gram / cm3. To prepare this solution, measure 237.5 milliliters of water.
Check: 12.5 + 237.5 = 250;