# Oak cuboid

Oak timber is rectangular shaped with dimensions of 2m, 30 cm and 15 cm. It weight is 70 kg. Calculate the weight 1 dm³ of timber.

Correct result:

m =  0.778 kg

#### Solution:

$V_{1}=20 \cdot \ 3 \cdot \ 1.5=90 \ \\ m_{1}=70 \ \\ m=m_{1} / V_{1}=70 / 90=\dfrac{ 7 }{ 9 }=0.778 \ \text{kg}$

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