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Question

1st Solution-300g of 25% w/w

2nd Solution-400g of 40% w/w

When both mixed, find the percentage of solute of final solution

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Solution

According to question,
300g of 25% solution contains solute = (300 x 25) / 100 = 75g
&
400g of 40% solution contains solute = (400 x 40) / 100 = 160g
Total solute = 75 + 160 = 235g
As given in the question, total solution =300 + 400 = 700g
Percentage of solute in the final solution = (235 x100) / 700 = 33.5%
Percentage of water in the final solution = 100 - 33.5 = 65.5%

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