Density of the concrete

Find the density of the concrete of the cuboid-shaped column has dimensions of 20 x 20 cm x 2 m if the weight of the column is 200 kg.

Correct result:

h =  2500 kg/m³

Solution:

$$\begin{gathered} a=20\text{ cm}\to \text{ m}=20\mathrm{/}100\text{ m}=0.2\text{ m } \\ b=20\text{ cm}\to \text{ m}=20\mathrm{/}100\text{ m}=0.2\text{ m } \\ c=2\text{ m } \\ m=200\text{ kg } \\ V=a\cdot b\cdot c=0.2\cdot 0.2\cdot 2={\displaystyle \frac{2}{25}}=0.08{\text{m}}^3 \\ h=m\mathrm{/}V=200\mathrm{/}0.08=2500{\text{kg/m}}^3 \end{gathered}$$

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