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October 31 2017
Question A 20 litre mixture of milk and water contains milk and water in the ratio 3:2. 10 litre of mixture is removed and replaced with pure milk the operation is repeated once more. At the end of the two removal and replacement, what is the ratio of milk and water in the resultant mixture?
Answer

The 20 litre mixture contains milk and water in ratio of 3:2.

therefore, there will be 12 litres of milk in the mixture and 8 liters of water in the mixture.

STEP 1: When 10 litres of the mixture is removed, 6 liters of milk is removed and 4 litres of water is removed. Therefore, there will be 6 litres of milk and 4 litres of water left in the container. It is then replace with pure milk of 10 litres. Now the container will have 16 litres of milk and 4 litres of water.

STEP 2: When 10 litres of the new mixture is removed, 8 liters of milk and 2 litres of water is removed. the container will have 8 litres of milk and 2 liters of water in it. Now 10 litres of pure milk is added.

therefore, the container will have 18 litres of milk and 2 litres of water in it at the end of the second step.

Therefore, the ratio of milk and water is 18:9 or 9:1

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