Answer:
![1 (3)/(16)\ lb](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6j2eymia873kvkpgik1rojifbxhsoo38w8.png)
Explanation:
You know that Sara has 8 ounces of vanilla yogurt in her cup and her father’s yogurt weighs 11 ounces. Then, the total ounces of frozen yogurt they buy altogether is:
![total_((ounces))=8\ oz+11\ oz\\\\total_((ounces))=19\ oz](https://img.qammunity.org/2020/formulas/mathematics/middle-school/muhgkjmoivtpz0vrmc6k18wpux1ndvafmf.png)
The next step is to make the conversion from ounces to pounds.
You need to remember that:
![1\ lb=16\ oz](https://img.qammunity.org/2020/formulas/mathematics/middle-school/nz5xo7q8mputnv6irv0hdiw3onpkfdw6ha.png)
Therefore:
![total_((pounds))=(19\ oz)((1\ lb)/(16\ oz))=(19)/(16)\ lb](https://img.qammunity.org/2020/formulas/mathematics/middle-school/7ce861i19h5lhsf9bgcul05c38ncgosju6.png)
This result expressed as a mixed number, is:
![total_((pounds))=1(3)/(16)\ lb](https://img.qammunity.org/2020/formulas/mathematics/middle-school/pimzlgadvegsxv4at2ugnmxxq03w3czqj5.png)