Flower bed

The park has a rectangular flower bed with dimensions of 3.2m and 1.5m. How many rose bushes will we plant in the flower bed if 20 dm² are needed for one bush?

Correct answer:

n =  24

Step-by-step explanation:

$$\begin{gathered} a=3.2\text{ m } \\ b=1.5\text{ m } \\ {S}_1=20{\text{dm}}^2\to {\text{m}}^2=20\mathrm{/}100{\text{m}}^2=0.2{\text{m}}^2 \\ S=a\cdot b=3.2\cdot 1.5={\displaystyle \frac{24}{5}}=4\frac{4}{5}=4.8{\text{m}}^2 \\ n=S\mathrm{/}{S}_1=4.8\mathrm{/}0.2=24 \end{gathered}$$

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