An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 121.25 amu. What is the percent abundance of ¹²²X?

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

the right answer is c i just did the question.