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

`25%` sol. Means `25 g` solute in `100 g` solution `40%` solution means `40 g` solute in `100 g` solution
Mass of solute in `300 g` solution =`(25xx300)/(100)=75 g`
Mass of solute in `400 g` solution `=(40xx400)/(100)= 160 g`
`:.` Total mass of solute`=75+160=235 g`
`:.` Mass `%` in mixture `=(235)/(700)xx100=33.57%`