Solution
For this case we have the following ratio:
birds to fish = 4 to 5
And if we have 18 fish we want to find the number of birds
We can create this relationship:
[tex]\frac{4}{5}=\frac{x}{18}[/tex]
Solving for x we got:
[tex]x=18\cdot\frac{4}{5}=\frac{72}{5}[/tex]
