Question

A solution is obtained by mixing $200\, g$ of $30\%$ and $300\, g$ of $20\%$ solution by weight. What is the percentage of solute in the final solution?

• A. $50\%$
• B. $28\%$
• C. $64\%$
• D. $24\%$

Answer 1

Answer: (D)

$24\%$

Answer 2

Solute in $200\, g$ of $30\%$ solution $= 60\, g$ Solute in $300 \,g$ of $20\%$ solution $= 60\, g$ Total grams of solute $= 120 \,g$ Total grams of solution $= 200 + 300 = 500 \,g$ $\%$ of solute in the final solution $= \frac{120}{500}\times100 = 24\%$