Question : There is 10% water in a 40-litre solution of milk and water. If 10 litres of water are added to this solution, then what percentage of the new solution will be water?
Option 1: 25%
Option 2: 20%
Option 3: 35%
Option 4: 28%
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Correct Answer: 28%
Solution : According to the question Initially, in the 40-litre solution, 10% is water i.e 0.10 × 4 = 4 litres When 10 litres of water are added, the total amount of water becomes = 4 + 10 = 14 The total volume of the new solution = 40 + 10 = 50 ⇒ Percentage of water = $\frac{\text{ amount of water}}{\text{Total Volume}}$×100 = $\frac{14}{50}$×100 = 28% Hence, the correct answer is 28%
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