Question : In a mixture of 25 litres, the ratio of milk to water is 4 : 1. Another 3 litres of water is added to the mixture. The ratio of milk to water in the new mixture is:
Option 1: 5 : 1
Option 2: 5 : 2
Option 3: 5 : 3
Option 4: 5 : 4
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Correct Answer: 5 : 2
Solution : The total quantity of the mixture is 25 litres. Milk : Water = 4 : 1 Milk = $\frac{4}{5}$ × 25 = 20 litres, Water = $\frac{1}{5}$ × 25 = 5 litres If 3 litres of water are added then the ratio becomes = 20 : (5 + 3) = 20 : 8 = 5 : 2 Hence, the correct answer is 5 : 2.
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