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Ratio and Proportion

From a vessel containing 81 liters of spirit, 9 liters are drawn out and the vessel filled with water.
Again, 9 liters of the mixture are drawn out and the vessel is filled up with water. The ratio of
spirit and water in the vessel now is
1. 64 : 81
2. 17 : 81
3. 64 : 17
4. 17 : 64

In 1st case, spirit = 72 liters and water = 9 liters. In 2nd case, spirit = (72-8) liters. i.e., 64 liters and water = (9-1+9) liters. i.e., 17 liters. Radio of spirit and water is 64 : 17, therefore

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