300 g of salt solution has 40% salt in it. How much salt should be added to make it 50% in the solution?
Correct Answer: Description for Correct answer:
40% is salt in 300 g of salt solution.
Then, quantity of salt = \( \Large \frac{40 \times 300}{100} \)= 120 g
Now, by the condition in the question,
\( \Large \frac{120+x}{300+x}=\frac{50}{100} \)
= \( \Large \frac{120+x}{300+x}=\frac{1}{2} \)
= 240 + 2x = 300 + x
Therefore, x = 60 g
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