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Chemistry diffusion problem?

In preparation for a combustion demonstration, a professor’s assistant fills a balloon with equal molar amounts of H2 and O2, but the demonstration has to be postponed until the next day. During the night, both gases leak through pores in the balloon. If 35% of the H2 leaks, what is the O2/H2 ratio in the balloon the next day? I calculated the diffusion ratio of O2/H2 and I get 1/4. The answer is 1.4 but I need help figuring out what to do next?

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