# 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.

Result

m =  0.778 kg

#### Solution:

$V_{ 1 } = 20 \cdot \ 3 \cdot \ 1.5 = 90 \ \\ m_{ 1 } = 70 \ \\ m = m_{ 1 } / V_{ 1 } = 70 / 90 = \dfrac{ 7 }{ 9 } \doteq 0.7778 = 0.778 \ \text { kg }$

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#### Following knowledge from mathematics are needed to solve this word math problem:

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