The given expression is
![3x+17](https://img.qammunity.org/2023/formulas/mathematics/high-school/6yxtgj838us09ptm57ngqfyf5e5u4q153w.png)
The description and the word problem can be written as 17 more than three times the number x.
the word problem is,
There are b boys in the class. The number of boys is 17 greater than three times the number of girls.
Then take the number of girls as x.