self Maths Puzzle

From a solution containing milk and water in the ratio 3 : 4, 10 L is removed and replaced by water. If the resultant solution contains milk and water in the ratio 1 : 2 then what was the amount of the original solution

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self Other Question

In a container having 1,000 L of pure alcohol, 100 L is replaced by equal quantity of water. This is done thrice. What will be the final volume of alcohol in the mixture? 10% of a solution of milk and water is removed and then replaced with the same amount of water. If the resulting ratio of milk and water is 2 : 3, find the ratio of milk and water in the original solution.