Set up (show work) and calculate the average atomic mass of an unknown element X with two isotopes, if X-12 makes up 40% of the element and X-14 makes up 60% of the element. (percent abundances)

Set up (show work) and calculate the average atomic mass of an unknown element X with two

isotopes, if X-12 makes up 40% of the element and X-14 makes up 60% of the element.
(percent abundances)

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