Question : 8 litres of water is added to 32 litres of a solution containing 20% alcohol in water. What is the approximate concentration of alcohol in the solution now?
Option 1: 24%
Option 2: 16%
Option 3: 8%
Option 4: 12%
Correct Answer: 16%
Solution :
The quantity of solution is 32 litres.
Amount of alcohol = $\frac{20}{100}$ × 32 = 6.4 litres
When 10 litres of water is added to the solution, it becomes 32 + 8 = 40 litres
$\therefore$ Percentage of alcohol in the new solution = $\frac{6.4}{40}$ × 100 = 16%
Hence, the correct answer is 16%.
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