Answer: She have to drink 3 bottles of water.
Explanation:
Given: Weight of Kathryn = 121.5 pounds
half of her weight =
So, she need to drink 60.75 pounds of water.
Kathryn's water bottle holds 20.25 ounces.
Number of water bottles she need to drink = (half of her weight) ÷ (Capacity of bottle)
Hence, she have to drink 3 bottles of water.