From The question,
The daily supply of oxygen is provided by 625square feet lawn.
The total square feet of lawn supply daily = 11,875.
using comparison
625 sq ft provide oxygen for one organism
11875square ft will provide oxygen for Y-organism
[tex]\begin{gathered} 625\text{ = 1} \\ 11875\text{ =Y} \\ \text{then Y = }\frac{11875}{625} \\ Y\text{ = 19} \end{gathered}[/tex]11,875 square feet will supply oxygen for 19 organisms
