A 240-litre mixture contains milk and water in the ratio 7 : 3. How many litres of water must be added to make the ratio 4 : 3?

💡 Solution & Explanation

Milk = 240 × 7/10 = 168 litres and water = 72 litres. Adding water does not change the milk. For milk : water = 4 : 3, the water must be 168 × 3/4 = 126 litres. So add 126 − 72 = 54 litres of water.