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Concentration when done wrt mass or volume [closed]

I have a question asked in jee main 2020. 10.30 mg of o2 is dissolved into a litre of sea water of density 1.03 g/ml. The concentration of o2 in ppm is?

Well I know that ppm is generally possibly mostly done as mg/L. Now in this question doing this we get 10.30 as the answer but the answer is 10 which suggests that it’s done in some other mass related unit. How to understand when to use mass or volume? Please help me out.

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