Answer
7 to 5
Work Step by Step
Restate as division to express in lowest terms. (Note that the 2's cancel in the final multiplication step.)
$3\frac{1}{2}\ to\ 2\frac{1}{2}=\frac{7}{2}\ to\ \frac{5}{2}=\frac{7}{2}\div \frac{5}{2}=\frac{7}{2}\times \frac{2}{5}=\frac{7}{5}=7\ to\ 5$
