This is the result of $\displaystyle{20}\div{70}\frac{{1}}{{2}}\usepackage{cmbright}\Huge\$ . This would show the size of each group when 20 is divided into $\displaystyle{70}\frac{{1}}{{2}}\usepackage{cmbright}\Huge\$ equal groups. You need to find the size of each group when $\displaystyle{70}\frac{{1}}{{2}}\usepackage{cmbright}\Huge\$ is divided into 20 equal groups. $\displaystyle{70}\frac{{1}}{{2}}\div{20}\usepackage{cmbright}\Huge\$