Answer :
The formula to obtain the mass of solution is toad up the mass of solute and mass of solvent.
Here, solute is salt and its mass is given as 15% and if we assume the solution in terms of 100 grams then the mass of salt will be 15 grams.
Therefore, the equation would be 15 / (a + 15)) x100.
Here ‘a’ has been assumed as mass of water. So, if we solve the above equation then we get a = 85, which means to obtain 15% salt solution 85 % of water should be added.
Here, solute is salt and its mass is given as 15% and if we assume the solution in terms of 100 grams then the mass of salt will be 15 grams.
Therefore, the equation would be 15 / (a + 15)) x100.
Here ‘a’ has been assumed as mass of water. So, if we solve the above equation then we get a = 85, which means to obtain 15% salt solution 85 % of water should be added.