Solution :
Given that , at a party there were four large submarine sandwiches all the same size .
During the party 2/3 of the chicken sandwich, 3/4 of the tuna sandwich, 7/12 of the roast beef sandwich and 5/6 of the veggie sandwich were eaten
Remained chicken sandwich

Remained tuna sandwich

Remained roast beef sandwich

Remained veggie sandwich

Hence, Veggie Sandwich had the least amount left .