How was this problem calculated (chemistry – relative atomic mass)?

I've tried a few things, but everything, except for the 24 before the decimal point, isn't the same as in the given solution. Can anyone tell me how to solve this problem, since I have no other way to get the information from others.

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Halswirbelstrom
1 year ago

Correction

LG H.

Halswirbelstrom
1 year ago
Reply to  dudu000703

typos, sorry.