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

$\begin{array}{1 1}66.5\%\\76.5\%\\85.6\%\\55.5\%\end{array} $

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300 g of 25% solution contains solute =75g
400 g of 40% solution contains solute = 160g
Total mass of solution = 300 + 400
$\Rightarrow 700$ g
% of solute in the final solution = $\large\frac{235}{700}$$\times 100$
$\Rightarrow 33.5\%$
% of water in the final solution =100-33.5
$\Rightarrow 66.5\%$
answered Aug 4, 2014 by sreemathi.v

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