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I am doing a chemistry problem but it is mainly mathematics

Here it is.

A little info that is useful to this problem.

Molar mass is always an average, given by

Molar Mass = (mass of isotope1 * abundance of isotope 1) + (mass of isotope2 + abundance of isotope 2)

Masses of isotopes are always constant, they do not vary from place to place.

So how do I solve this?

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# So easy but yet I can't solve it

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