Respuesta :

Zachary101234
We know that each drink costs 2 dollars. and there is 3 people. 2*3=6  
21-6=15 

15/3 = 5

1 sandwich costs 5 dollars! (thats a lot) 
Hope this helps you
Slothicorn13
1 sandwhich : $5
Cause the 3 drinks that equals $6 and $21 - $6 = 15 and 15\3 people is 5