Question

Jason has ​one third of a gallon of milk.

Answer 1

1/12 
(1/3) divided by 4 is (1/3) x (1/4)
That would equal 1/12

Answer 2

1/3 is 0.33 repeating
0.33/4 is 0.0833 repeating
0.0833 is 1/12
Each serving will be 1/12 gallon of milk.