How much

How much money will we pay for 20 planks 4m long, 15cm wide and 26mm thick when 1m³ of wood costs 4500kč?

Correct answer:

x =  1404 Kc

Step-by-step explanation:

$$\begin{gathered} a=4\text{ m } \\ b=15\mathrm{/}100={\displaystyle \frac{3}{20}}=0.15\text{ m } \\ c=26\mathrm{/}1000={\displaystyle \frac{13}{500}}=0.026\text{ m } \\ {V}_1=a\cdot b\cdot c=4\cdot 0.15\cdot 0.026={\displaystyle \frac{39}{2500}}=0.0156{\text{m}}^3 \\ V=20\cdot V_1=20\cdot 0.0156={\displaystyle \frac{39}{125}}=0.312{\text{m}}^3 \\ x=4500\cdot V=4500\cdot 0.312=1404\text{ Kc} \end{gathered}$$

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