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moles percentage of helium-oxygen mixture

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I am trying to figure out what percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.528g/L at 25C and 721mmHg (torr).

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It finds the mole percentage of the helium-oxygen mixture given its density. The solution is detailed and has a '5/5' rating.

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You have found the molar mass of the mixture as 13.6 g/mol.

The molar mass of He is 4 g/mol.
The molar mass of O2 is 2 * 16 = 32 g/mol

Now assume there ...

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