This question was given an excellent answer to address a practical problem. Then it was put on hold. Reasons given were that it's a homework question, and that nothing was done to attempt to solve the problem.
As for the first complaint, the question was simplified by request from the original to make it somewhat solvable, though this made it more homework-like; also a picture was added showing the container in question. Whatever process people are using to identify a problem as "homework" doesn't seem to be 100% reliable.
As for the second complaint, I can only say there's no attempt given to solve the problem on the basis that I don't have the expertise to select the appropriate formula to solve the problem, at least, not the level of expertise demonstrated in @JMLCarter's excellent, detailed, and deleted answer.
Is there an appropriate way to get solutions to practical problems using the physics site?