A 45 litre mixture contains milk and water in the ratio 4 : 1. How much milk must be added so that the ratio becomes 6 : 1?
Correct answer C. 18 litres
Explanation
Milk = 36 litres, water = 9 litres. For 6 : 1 the milk must be 54 litres, so 54 - 36 = 18 litres of milk is added.
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