Incorrect. From the description, David $\displaystyle{\left({d}\right)}\usepackage{cmbright}\Huge\$ age is at least $\displaystyle{\left(\ge\right)}\usepackage{cmbright}\Huge\$ Sally’s age $\displaystyle{\left({s}\right)}\usepackage{cmbright}\Huge\$ plus five years. Check values for David’s and Sally’s ages in your inequality and make sure that they work.