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When 400 g of a `20%` solution by weight was cooled, 50 g of solute precipitated. What is the percentage by mass of solute in the remaining solution ?

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When 400 g of a `20%` solution by weight was cooled, 50 g of solute precipitated. What is the percentage by mass of solute in the remaining solution ?
A. `8.57%`
B. `15%`
C. `12.25%`
D. `9.5%`
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Correct Answer - A
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