we simply subtract 3½ from it hmmm let's first convert the mixed fractions to improper, and then subtract.
[tex] \bf \stackrel{mixed}{6\frac{3}{5}}\implies \cfrac{6\cdot 5+3}{5}\implies \stackrel{improper}{\cfrac{33}{5}}
\\\\\\
\stackrel{mixed}{3\frac{1}{2}}\implies \cfrac{3\cdot 2+1}{2}\implies \stackrel{improper}{\cfrac{7}{2}}\\\\[-0.35em]
\rule{34em}{0.25pt}\\\\
\cfrac{33}{5}-\cfrac{7}{2}\implies \stackrel{\textit{using an LCD of 10}}{\cfrac{(2)33-(5)7}{10}}\implies \cfrac{66-35}{10}\implies \cfrac{31}{10}\implies 3\frac{1}{10} [/tex]
