A mixture of hydrogen and helium is introduced under a heavy piston sliding without friction inside a vertical evacuated vessel, resulting in the piston being located in the middle of the vessel. Over time, the piston moves downward, since the material from which it is made turns out to be permeable to one of the gases - helium. The final equilibrium position of the piston is at 1/3 of the height of the cylinder. What is the ratio of the masses of hydrogen and helium in the mixture?

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