Kim order a sandwich and had it cut into equal pieces she and 3 friends ate the same number of pieces 1/4 of the sandwich was not eaten .for dinner that night, she ate 3 pieces, which were 1/3 of the leftovers. how many pieces were there originally?

If 3 =1/3
3/3= 9 so 9 was leftovers
1/4
4/1
4*9
36 total pieces at start.
p.s. that sandwich is either monster or kim needs to eat more, who eats 1/12 of a sandwich that is just...
also idk how they ate the same number of pieces, each would have had to eat 6.75 pieces