###Human: Sean buys 3 cans of soda, 2 soups, and 1 sandwich.  Each soup cost as much as the 3 combined sodas.  The sandwich cost 3 times as much as the soup.  If the soda cost $1 how much did everything cost together?, ### Assistant: The soda cost 3*1=$3
So the soups cost 2*3=$6
The sandwich cost 3*3=$9
So the total cost of everything was 3+6+9=$18 
 So the answer is :  18