Problem
4)) Isaiah takes 25 hours to treat 75 lawns with organic fertilizer at a housing complex. The lawns in the complex are the same size. (1) At this rate, how many hours will it take Isaiah to treat 9 lawns that are about the same size? Complete the table. \begin{tabular}{|c|c|c|} \hline \multicolumn{1}{|c|}{} & + \\ \hline Lawns & 75 & 9 \\ \hline Time \( (\mathrm{h}) \) & 25 & \\ \hline \end{tabular}
Solution
Step 1 ：\( \text{Rate} = \frac{\text{Lawns}}{\text{Time}} \)
Step 2 ：\( \text{Rate} = \frac{75}{25} = 3 \text{ lawns/hour} \)
Step 3 ：\( \text{Time} = \frac{\text{Lawns}}{\text{Rate}} = \frac{9}{3} = 3 \mathrm{h} \)
