Zac's age to Ed's age is:
2:1
[tex]\begin{gathered} 18\cdot\frac{1}{2}=9-->\text{ Ed's age} \\ Tim^{\prime}s\text{ 2/3 Zac's age} \\ 18\cdot\frac{2}{3}=12\text{ --> Tim's age} \end{gathered}[/tex]The difference between Ed's and Tim's age is:
12-9=3 years
