What exactly do you mean? Is there answer's to the problem or more to the problem?
The fact that it can turn its head 180 degrees is just extra information. They tell us that it is 10.5 cm long. What they're asking for is the length in a mixed number, so 10.5 as a mixed number.
Answer: Celine, 4092 ml
Step-by-step explanation:
Given
1 bottle contains 341 ml Juice
Celine buys 2 cases of 24 bottles i.e. a total of 48 bottles
Nicole buys 3 cases of 12 bottles i.e. a total of 36 bottles
Amount of Juice Celine has
Amount of Juice Nicole has

Thus, Celine has more juice than Nicole

Celine has 4092 ml more than Nicole