college Exam Numerical Ability Alligation or Mixture

A mixture contains milk and water in the ratio 2:3 for a total of 35L. the amount of water added so that the new ratio becomes 1:2 is?

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college Other Question
A man died by hanging himself to the roof in his room which is empty(i.e., inside the room there are nothing like chairs,tables etc., only himself and a rope with which he hanged). When the neighbors and police came to see him, the floor of the room is wet and contains water on the floor.

How did he died??