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

Answer

`31.9%`

Explanation

Mass of `25% sol A =(25)/(100)xx300=75g`
mass of `40% sol B (40)/(100)xx400=160g`
`%` composition of `A`
`=(75xx100)/(75+160)=(75xx100)/(235)=31.9%`
`%` composition of `B=100-31.9 = 68.1%`