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Two jars, A and B, both contain 20% milk. The quantity in jar A is 4 times that of jar B. The mixtures in both jars are mixed to form a new mixture C, and 15 litres of water is added. The final ratio of water to milk is now 19:4. What is the initial quantity of milk in jar B?

1. 5
2. 4
3. 10
4. 8

Correct answer: 8

Solution

Since both jars have 20% milk, the combined mixture also has 20% milk. Let the quantity in jar B be x litres, so jar A has 4x litres and milk in B is 20% of x. After mixing and adding 15 litres of water, the final water-to-milk ratio becomes 19:4, which allows the original quantity to be determined as 8 litres of milk in jar B.

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