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

Explanation

Given a solution is obtained by mixing 300 gms of `25%` solution and 400 gms of `40%` solution by mass.
Weight of solute in `1^("st")` solution `=300xx(25)/(100)=75" gms"`
Weight of solute in `2^(nd)` solution `=400xx(40)/(100)=160" gms"`
Total weight of solute `=75+160=235" gms"`
Total weight of solution `=300+400=700" gms"`
Mass % of solute in resulting solution `=(235)/(700)xx100=33.5%`