A 60 litre mixture contains milk and water in the ratio 7 : 3. How much water must be added to make the ratio 7 : 5?
Correct answer A. 12 litres
Explanation
Milk = 42 litres, water = 18 litres. For 7 : 5 the water must be 42 x 5/7 = 30 litres, so add 30 - 18 = 12 litres.
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