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is it for your av? i'll make it as big as possible while making ti legit

There are only two isotopes of an element with 69 and 71 neutrons. The relative atomic mass of the Element is 69.72. What is the % abundance of each, i got the equation (%no 1 * 69) + ((100 - %no 1 ) * 71)/100 where do i go from here?