$\displaystyle\frac{{12}}{{198}}=\frac{{2}}{{33}}\usepackage{cmbright}\Huge\$ and $\displaystyle\frac{{14}}{{231}}=\frac{{2}}{{33}}\usepackage{cmbright}\Huge\$ . Because $\displaystyle\frac{{2}}{{33}}=\frac{{2}}{{33}}\usepackage{cmbright}\Huge\$ , the ratios that describe each situation are equivalent fractions.