# How much

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

Result

x =  1404 Kc

#### Solution:

$a=4 \ \text{m} \ \\ b=15 /100=\dfrac{ 3 }{ 20 }=0.15 \ \text{m} \ \\ c=26/1000=\dfrac{ 13 }{ 500 }=0.026 \ \text{m} \ \\ \ \\ V_{1}=a \cdot \ b \cdot \ c=4 \cdot \ 0.15 \cdot \ 0.026=\dfrac{ 39 }{ 2500 }=0.0156 \ \text{m}^3 \ \\ V=20 \cdot \ V_{1}=20 \cdot \ 0.0156=\dfrac{ 39 }{ 125 }=0.312 \ \text{m}^3 \ \\ \ \\ x=4500 \cdot \ V=4500 \cdot \ 0.312=1404 \ \text{Kc}$

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