Rectangular flowerbed

The park has a rectangular flowerbed measuring 10 m and 200 cm. How many rose bushes do we plant in the flowerbed if 25 dm² are needed per bush?

Final Answer:

n =  80

Step-by-step explanation:

$$\begin{gathered} a=10\text{m} \\ b=200\text{cm}\to \text{m}=200:100\text{m}=2\text{m} \\ {S}_1=25{\text{dm}}^2\to {\text{m}}^2=25:100{\text{m}}^2=0.25{\text{m}}^2 \\ S=a\cdot b=10\cdot 2=20{\text{m}}^2 \\ n=S/S_1=20/0.25=80 \end{gathered}$$

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