Answer:
Sammy's age is 8 years.
Explanation:
Let s represent Sammy’s age.
We have been given that Lisa’s age is 4 years older than three times Sammy’s age.
Three times Sammy’s age would be
.
4 years older than three times Sammy’s age would be
.
We are also told that Lisa is 28 years old. We can represent this information in an equation as:
![3s+4=28](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6hd1eubpesh8e4l4k1kszmxuan76khyi4i.png)
![3s+4-4=28-4](https://img.qammunity.org/2020/formulas/mathematics/middle-school/khgdytnvbi8bq9ursxzdvsqxrlzvji3v2r.png)
![3s=24](https://img.qammunity.org/2020/formulas/mathematics/middle-school/yw7ha7d1s5a939yr1w3akcl2mpl52zdrps.png)
![(3s)/(3)=(24)/(3)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/kh0huuffdt7wv6p27ehfxfa458fw3smwao.png)
![s=8](https://img.qammunity.org/2020/formulas/mathematics/middle-school/kng532cflu9ex1ie9ublmz7977imy9990m.png)
Therefore, Sammy's age would be 8 years.