1/3 of the milk carton+ 5/12 of the milk carton+ 1/6 of the milk carton
= (4+5+2)/12 of the milk carton (common denominator).
= 11/12 of the milk carton.
Sammy, Tikki, and Georgia totally drink 11/12 of the milk carton.
1 milk carton- 11/12 of the milk carton
= 12/12 of the milk carton- 11/12 of the milk carton
= 1/12 of the milk carton.
There is 1/12 of the milk carton left over, so the final answer is 1/12 of the milk carton.
Hope this helps~