How much water (in litres) must be added to an 80-litre mixture of milk and water, containing 10% milk, so that it becomes a 5% milk solution?

The 80 litre mixture contains 10 percent milk, which is 8 litres, and the rest is 72 litres of water. For the 8 litres of milk to be 5 percent of the new mixture, the total volume must be 8 divided by 0.05, equaling 160 litres. The amount of water to add to reach this total is 160 minus 80, which equals 80 litres.

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