Answer:
Dan and Anja are both correct.
Explanation:
Base on the given;
Total:

Dan:
1st Bottle:

2nd Bottle:

3rd Bottle:

Anja:
1st Bottle:

2nd Bottle:

3rd Bottle:

Since we know all the info now. Let's first add up all the bottles.
Dan:
⇒ Only add the numerator.
⇒ Simplify

Anja:
⇒ Only add the numerator.
⇒ Simplify

Base on the given;
Total =

From what we solve:
Dan and Anja are both correct.
Since the drop-down menus wasn't given. I can not farther given more info. Please have a link to the image if help is needed.
RevyBreeze