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If 79Br is one of the isotopes, what is the other isotope given the atomic mass of bromine is approximately 80 amu?

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With no more information than that I would guess that
Two isotopes so we average them out.
I would guess that 80 = (79 + x)/2
160 = 79 + x
x = about 160 - 79 = about 81 for the other isotope.

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