[tex]\text{Charles walked on a treadmill 16}\frac{3}{4}\text{miles}[/tex][tex]\begin{gathered} 16\frac{3}{4}\text{ miles=4 days} \\ (16\frac{3}{4}\times\frac{1}{4})miles=1\text{ day} \\ 1\text{ day= }\frac{67}{4}\times\frac{1}{4}=\frac{67}{16}=4\frac{3}{16}\text{ miles} \end{gathered}[/tex]