Seedling flowerbed fence

We need 25 dm² of soil for each seedling, we planted 30 seedlings on a square-shaped bed, and there is another 1.5 m² of free soil for the spacing between them. How much mesh do we need to buy to fence the flowerbed?

Final Answer:

x =  12 m

Step-by-step explanation:

$$\begin{gathered} S_1=25{\text{dm}}^2\to {\text{m}}^2=25:100{\text{m}}^2=0.25{\text{m}}^2 \\ {S}_2=1.5{\text{m}}^2 \\ S=30\cdot S_1+S_2=30\cdot 0.25+1.5=9{\text{m}}^2 \\ S=a^2 \\ a=\sqrt{S}=\sqrt{9}=3\text{m} \\ x=4\cdot a=4\cdot 3=12\text{m} \end{gathered}$$

Try another example