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

300g of 25% solution will contain `=(25xx300)/(100)`
`=75g` of solute.
400g of 40% solution will contain
`=(40xx400)/(100)=160g` of solute
`therefore` total mass of solute `=160+75=235g`
Total mass of solution `=300+400=700g`
Now, the percentage of solute in solution
`=(235)/(700)xx100=33*5%`
and, the percentage of water is solution
`=100-33*5%=66*5%`