We know that
• The bike costs $245.
,• Jennifer adds $15 per week to her savings.
Let's call w weeks. Based on the given information, we express the following.
[tex]\begin{gathered} 15w=245 \\ w=\frac{245}{15} \\ w=16.3333\ldots \end{gathered}[/tex]Notice that we can't say 16 weeks, otherwise, the money wouldn't be enough to buy it.