Answer:
Mary bought the most flour
Explanation:
Ana bought 12 3/6 kg of flour
12 3/6 = 75/6 = 12.5 kg of flour
Mary has brought 14 2/8 kg of flour
14 2/8 = 114/8 = 14.25 kg of flour
Kristina bought 11 8/12 kg of flour.
11 8/12 = 140/12 = 11.66 kg of flour
So, Mary bought the most flour.