Question : A sugar solution of 3 litres contains 60% sugar. One litre of water is added to this solution. Then the percentage of sugar in the new solution is:
Option 1: 30%
Option 2: 45%
Option 3: 50%
Option 4: 60%
Correct Answer: 45%
Solution :
The quantity of sugar is 3 litres.
Amount of sugar in solution $=\frac{60}{100} × 3 = 1.8$ litres
If 1 litre of water is added, the new solution becomes = 3 + 1 = 4 litres
Percentage of sugar in new solution $=\frac{1.8}{4}×100 = 45\%$
Hence, the correct answer is 45%.
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