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The ratio of milk and water in a mixture of 108 litres is 2:1. If 40 litres of water is added to the mixture, what is the ratio of milk and water in the final mixture?

1. 13: 17
2. 18: 19
3. 17: 15
4. 15: 17

Correct answer: 18: 19

Solution

In 108 litres with milk:water = 2:1, milk = 72 litres and water = 36 litres. After adding 40 litres of water, water becomes 76 litres. So the final ratio of milk to water is 72:76 = 18:19.

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