A solution is obtained by mixing 300 g of 25% solution and 400 g of 40% solution by mass. Calculate the mass percentage of the resulting solution.

Explanation

300 g of 25% solution contains = 75 g solute
400 g of 40% solution contains = 160 g solute
Total solute = 75 + 160 = 235 g
Total solution = 300 + 400 = 700 g
Percentage of solute in the solution = `235/700 xx 100 = 33.5%`
Percentage of water in the solution = 100 - 33.5 = 66.5%.