2 and 3/4 punds of roast beef   2  3/4 =  (4x2) + 3 /4=  11/4 roast beef
1 and 7/8 pounds of turkey     1  7/8 =  15/8 turkey 
2 1/16 pounds of salami     2 1/16      33/16 salami
if you  put 1/4 of pound of meat 
then 11/4 roast beef   divided by 1/4 = 11/4 x4 = 11 sandwiches roast beef 
15/8 turkey divided  1/4 = 15/8   x 4 = 15/2  = 7 sandwishes
 33/16 salami divided  1/4  = 33/16 x 4 = 33/ 4 = 8 sandwiches