4 sandwiches for 3 people
each person gets 4/3 of a sandwich = 1 1/3 sandwiches
as each was cut in 1/3rds, each person ate 4 sandwiches where each sandwich was 1/3 of a full sandwhich
so the answer seems to be 4 or 1 1/3, depending on how you use the term "sandwich"
let p = the number of people
let S = total number of sandwiches
S/p = s = number of sandwiches each ate = 4/3 is probably the answer you want. although the problem is a little ambiguous
4/3 = 1 1/3 sandwiches per person