Calculate the percentage composition in terms of mass of solution obtained by mixing `300 g` of a `25%` and `400 g` of a `40%` solution by mass.

Explanation

A `25%` solution by mass means 25 g solute is present in 100 g solution. So, 75 g solute will be present in 300 g solution. In the same way, `40%` solution by mass means 40 g solute is present in 100 g solution. So, 160 g solute will be present in 400 g solution.
Total solute mass `= 160 + 75 = 235 g`
Total solution mass `= 400 + 300 = 700 g`
Percentage solute by mass `=(235)/(700)xx100=33.57%`