Wood prisms

How many weight 25 prisms with dimensions 8x8x200 cm? 1 cubic meter of wood weighs 800 kg.

Correct result:

m =  256 kg

Solution:

$$\begin{gathered} a=8\text{ cm } \\ b=8\text{ cm } \\ c=200\text{ cm } \\ n=25 \\ V=n\cdot a\cdot b\cdot c=25\cdot 8\cdot 8\cdot 200=320000{\text{cm}}^3 \\ {V}_1=V\to {\text{m}}^3=V\mathrm{/}1000000{\text{m}}^3=320000\mathrm{/}1000000{\text{m}}^3=0.32{\text{m}}^3 \\ h=800{\text{kg/m}}^3 \\ m=V_1\cdot h=0.32\cdot 800=256\text{ kg} \end{gathered}$$

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