Answer: She have to drink 3 bottles of water.
Explanation:
Given: Weight of Kathryn = 121.5 pounds
half of her weight =
![(121.5)/(2)=60.75\text{ pounds}](https://img.qammunity.org/2021/formulas/mathematics/high-school/wm9jp9kdk7yy63yk8n2oshutxfg13yhuwe.png)
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)
![=(60.75)/(20.25)\\\\=(6075)/(2025)\\\\=3](https://img.qammunity.org/2021/formulas/mathematics/high-school/ppfxxlubxbywp2i9t6vo1ok4bnpp5fk8bg.png)
Hence, she have to drink 3 bottles of water.