\( 300 \mathrm{gm} \) of \( 25 \% \mathrm{w} / \mathrm{w} \) solution of solute A is mixed with ...

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\( 300 \mathrm{gm} \) of \( 25 \% \mathrm{w} / \mathrm{w} \) solution of solute A is mixed with \( 400 \mathrm{gm} \) of \( 40(\mathrm{w} / \mathrm{w}) \) solution of another solute B. What is the \( \mathrm{w} / \mathrm{w} \) percentage of the new mixture?
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