Answer:
1/8 half-gallon or 1/16 full gallon
Explanation:
Emma and her 3 friends= Four people
Four people shared 1/2 gallon= 1/2 divided by 4
1/2 divided by 4= 1/8
Each person got 1/8 of the half gallon.
This would mean that out of a FULL gallon, they would get 1/16