[tex]\begin{gathered} \text{An hour is 60 minutes} \\ \frac{1}{2}\text{ of an hour is} \\ \frac{1}{2}\times60=30\text{ minutes} \\ 75\%\text{ of an hour is} \\ 0.75\times60=45\text{ minutes} \\ \text{comparing the two, Sara studied Tuesday the longest.} \end{gathered}[/tex]
