You may have solved this as an inverse variation problem. Because the problem says "varies directly," the equation to use is $\displaystyle{y}={k}{x}\usepackage{cmbright}\Huge\$ , where y is the amount earned and x is the number of hours worked. Substitute $\displaystyle{y}={66}\usepackage{cmbright}\Huge\$ and $\displaystyle{x}={12}\usepackage{cmbright}\Huge\$ , and solve for k. Then substitute the value of k and $\displaystyle{y}={154}\usepackage{cmbright}\Huge\$ into a new equation and solve for x.