Painter 3

Dad want to paint wall high 250 cm wide and 230 cm with wallpaper. How many meters must buy wallpaper if wallpaper width is 60 cm?

Correct answer:

x =  9.6 m

Step-by-step explanation:

$$\begin{gathered} a=250\text{ cm}\to \text{ m}=250\mathrm{/}100\text{ m}=2.5\text{ m } \\ b=230\text{ cm}\to \text{ m}=230\mathrm{/}100\text{ m}=2.3\text{ m } \\ s=60\text{ cm}\to \text{ m}=60\mathrm{/}100\text{ m}=0.6\text{ m } \\ S=a\cdot b=2.5\cdot 2.3={\displaystyle \frac{23}{4}}=5.75{\text{m}}^2 \\ x=S\mathrm{/}s=5.75\mathrm{/}0.6={\displaystyle \frac{115}{12}}=9.6\text{ m} \end{gathered}$$

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