Painter 3

Dad wants to paint the wall high 250 cm, wide 230 cm with wallpaper. How many meters must he buy wallpaper if the wallpaper width is 60 cm?

Correct answer:

x =  9.6 m

Step-by-step explanation:

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

Try another example