If the relative atomic mass of two isotopes 35m and 37m is 35.5.calculate the relative abundance of 37m.

Answer 1

35x + 37(1-x) = 35.5
x = 0.75
so, 75% 35m and 25% 37m

Or, just note that 35.5 is 25% of the way from 35 to 37, so 25% of the total is 37m.