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A 60-litre mixture of milk and water contains milk and water in the ratio 7:5. How much water must be added to make the ratio 7:8?

1. 10 L
2. 12 L
3. 15 L
4. 18 L

Correct answer: 15 L

Solution

In 60 L, milk = \(60\times \frac{7}{12}=35\) L and water = 25 L. To make the ratio 7:8, if milk is 35 L, water must be \(35\times \frac{8}{7}=40\) L. So, 15 L water must be added.

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