## Prealgebra (7th Edition)

Because they are each $\frac{1}{25}$ of the area maintained.
The sections labeled Lakes and Rivers are each marked $\frac{4}{100}$, so they each represent the same size portion of the areas maintained. $\frac{4}{100}=\frac{4\div4}{100\div4}=\frac{1}{25}$