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 =  0.7778 kg

Solution:

$$\begin{gathered} V_1=20\cdot 3\cdot 1.5=90 \\ {m}_1=70 \\ m=m_1\mathrm{/}{V}_1=70\mathrm{/}90={\displaystyle \frac{7}{9}}=0.7778\text{ kg} \end{gathered}$$

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