An empty container is filled with pure alcohol. The alcohol is slowly allowed to run out and when the container is 1/4 empty, it is replaced with water. Next, when the container is half empty it is again filled with water. Finally, when it is 3/4 empty, it is again filled with water. What percentage of container is alcohol now?
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Initially, there was no water content since the empty container was filled with pure alcohol. Then slowly alcohol was emptied part by part by adding that much amount of water.
Since they didn't ask about the water content, just leave it and only consider the depreciation of the alcohol.
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