You may have found only k, the constant of variation. Be sure to complete the problem by substituting $\displaystyle{k}={15}\usepackage{cmbright}\Huge\$ , $\displaystyle{w}={6}\usepackage{cmbright}\Huge\$ , and $\displaystyle{h}={3}\usepackage{cmbright}\Huge\$ in the equation $\displaystyle{V}={k}{w}{h}\usepackage{cmbright}\Huge\$ . The correct answer is 270 cubic inches.