To determine what fraction of the total number of hats was left over, we need to subtract the total fraction (7/7) from the hats sold:
[tex]\begin{gathered} \frac{7}{7}-\frac{4}{7}-(\frac{1}{4}\cdot\frac{1.75}{1.75})=\frac{7}{7}-\frac{4}{7}-\frac{1.75}{7} \\ \text{Total hats left=}\frac{1.25}{7} \end{gathered}[/tex]
