## Thinking Mathematically (6th Edition)

Consider the proportion relation between the pups tagged and observed in early August and late August. This forms the proportion relation as, $\frac{p}{900}=\frac{4963}{218}$ Here, $p$is the total number of fur seal pups in the rookery. Solve the above equation. \begin{align} & p=\frac{4963\times 900}{218} \\ & =20489.449 \end{align} This shows that the total number of fur seal pups in the rookery is approximately equal to 20489.