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That is an oddly phrased question.

If you're looking for the mass to luminosity relationship, it's generally L = M^3.5.

But your question asks for the mass to light ratio. I'm not sure what the "light" part is referring to. But as you are given the luminosity, and the mass, perhaps you mean the ratio between those two quantities? Then you just do some division to create a ratio...

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Q: What is the mass to light ratio of a 10 M Sun white dwarf with luminosity of 5x10 3 L Sun?
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