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One litre of water is evaporated from $6$ litres of a solution containing $4\%$ of sugar. The percentage of sugar in the remaining solution is:

  1. $\dfrac{7}{5}\% \\$
  2. $\dfrac{26}{5}\% \\$
  3. $\dfrac{24}{5}\% \\$
  4. $\dfrac{17}{5}\%$
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Answer is C. 

% of sugar = 4/100 * 6 = .24 litres

1 litre evaporated, so remaining 5 litres of solution

% of sugar contained in 5 litres of solution = $\frac{.24}{5}$*100 = 4.8% = $\frac{24}{5}$

Detailed solution is available here 

https://www.toppr.com/ask/question/a-litre-of-water-is-evaporated-from-6-litres-of-sugar-solution-containing-4-of/

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