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A 15-litre mixture has alcohol and water in the ratio 1:4. If 3 litres of water are added, what is the percentage of alcohol in the new mixture?

1. 15
2. 16⅔
3. 17
4. 18⅓

Correct answer: 16⅔

Solution

In 15 litres with ratio 1:4, alcohol = 15 × 1/5 = 3 litres. After adding 3 litres of water, total mixture = 18 litres, so alcohol percentage = (3/18) × 100 = 16⅔%.

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